Typing Posture and Wrist Position — Checked Against Japanese Government Guidelines

The adult numbers come from the MHLW guideline and its commentary (“Guideline for Occupational Health Management in Information Device Work,” Notification 0712-3 of July 12, 2019, partly revised by Notification 1201-7 of December 1, 2021). It sets out what employers should do for workers doing information-device work in offices. It asks that work outside offices follow it as far as possible, so it is a useful reference for practicing at home.

The children's numbers come from MEXT's “Guidebook for Using ICT with Attention to Students' Health” (revised March 2022).

The 40 cm for adults and the 30 cm for children come from two separate documents. Neither document says why the numbers differ. Both are lower limits, and farther is not simply better. The guideline also asks that there be no extreme difference between the distance to the screen and the distance to the keyboard.

The same commentary also says the preferable position, angle, and brightness differ from person to person, so each person has to adjust. Treat the numbers as a starting point.

Official guidance contains no rule such as “always float your wrists” or “use the palm rest only during breaks.” Here is what I could confirm.

• Without support, shoulder stiffness and pain increase (MHLW commentary)

  The commentary says that, according to research so far, shoulder stiffness and pain increase when there is no support to rest the arms or wrists on while typing. The guideline text says a palm rest (wrist rest) should be available when needed.

• A hand bent strongly toward the little-finger side increases arm fatigue and pain (same)

  The commentary also says that arm fatigue and pain increase when the hand bends strongly sideways (ulnar deviation).

• Keep the wrists straight (US OSHA)

  The US Occupational Safety and Health Administration's online material says hands, wrists, and forearms should be straight, in line, and roughly parallel to the floor. It also says wrist rests with sharp, hard leading edges can affect the forearms and wrists, and that keyboard feet should not be used if they increase bending of the wrist.

On speed, Feit et al. (2016) found that one thing fast typists had in common was that they moved the whole hand very little. That study did not compare floating wrists with resting wrists.

So I think the question is not which is correct but whether these three things hold for you.

• Are your wrists straight?

  While typing, check that the back of the hand and the forearm are close to a straight line and the hand is not bent strongly toward the little-finger side.

• Are your shoulders and neck tight?

  If holding your arms in the air makes your shoulders stiff, add somewhere to rest the arms or wrists, or revisit the chair and desk height.

• Does an edge dig in?

  Check that the edge of the desk or wrist rest is not pressing into your forearms or wrists.

The MHLW commentary says the angle between upper arm and forearm should be 90 degrees or more, with the keyboard within natural reach. It gives no upper limit. US OSHA says 90 to 120 degrees with the elbows kept close to the body. I could not confirm a source for “90 to 110 degrees,” so this article does not use it.

If you are unsure how to measure it, put your hands on the keyboard and check that your elbows are not sharply bent, your arms are not stretched out, and your shoulders are not hunched. If it does not fit, adjust the chair and desk in the order described in the next section.

Keep it about 40 cm or more away, with the top of the screen at about eye level or slightly below. The commentary says that, according to research so far, neck stiffness and pain increase as the head tilts further forward. If you find yourself leaning toward the screen, revisit the screen height and text size.

The commentary admits that a laptop, with its screen and keyboard in one piece, makes it hard to take the preferable desktop posture. For long use it says an external display is desirable, and for a small laptop used for long periods an external keyboard is desirable. For choosing a keyboard, see Choosing a Keyboard for Typing Practice.

Typing Musou is played on a computer's physical keyboard, or a tablet with an external keyboard. You cannot type with a phone's on-screen keyboard.

The MHLW commentary says that with an adjustable desk, you should set the chair height first and then adjust the desk. Follow that order.

1. 01.Sit deep in the chair with your back against the backrest.
2. 02.Set the height so the soles of your feet are flat on the floor. Use a footrest if they do not reach.
3. 03.Check that your fingers fit between the seat and the back of your thighs.
4. 04.Adjust the desk so the angle between upper arm and forearm is 90 degrees or more and the keyboard is within natural reach.
5. 05.If the desk is not adjustable, adapt with the chair height and a footrest. The commentary says a desk that cannot be adjusted should be about 65 to 70 cm high.

The commentary says it is desirable for a chair seat to be adjustable over a range of about 37 to 43 cm. That is the range a chair should be able to cover, not a target for your seat height. It is the height with the cushion compressed by 2 to 3 cm when you sit, and retail chairs usually list the uncompressed height, so the numbers will not match. For an adjustable desk, a range of about 60 to 72 cm is described as desirable.

Some numbers differ. MEXT's guidebook says keep the eyes at least 30 cm from the device and look into the distance for at least 20 seconds once every 30 minutes. It also says there is no single correct posture, and that not continuing to work in a strained posture for long is what matters. It adds that children may use devices at home in a bad posture for a long time, so guiding them before it becomes a habit is important.

If their feet do not reach the floor, use a footrest. That comes from the adult guideline, but the situation of dangling feet at a desk and chair that do not fit also happens to children.

Typing Musou has a “Break Reminders” setting: after 30 minutes of play, a “Take a short break” screen asks you to look away from the screen into the distance for 20 seconds. It is set to match MEXT's guideline. Details are in When Typing Tires or Hurts Your Wrists and Arms. For getting started at home, see Before You Start Typing at Home.

• Q. How high should the seat be?

  There is no fixed number. 37 to 43 cm is the range a chair should be able to adjust over. Set it so the soles of your feet are flat on the floor and your fingers fit between the seat and the back of your thighs.

• Q. Can I type standing up?

  The MHLW guideline says that besides sitting, it is desirable to stand from time to time. It gives no numbers for typing while standing. I think the screen height and arm angle can be set the same way as when sitting.

• Q. Will fixing my posture make me type faster?

  I could not find a study that directly measured the link between posture and typing speed. What official guidelines rest on is stiffness, pain, and fatigue. The break guideline rests on research showing more input errors after about an hour of continuous work. For breaks, see When your wrists and arms get tired or hurt from typing.

• Q. What about a tablet with an external keyboard?

  The MHLW guideline says that for long work on a tablet, optional devices such as a display, keyboard, and mouse should be available in a suitable arrangement. It does not specify the layout. The commentary also says it is desirable to avoid using tablets and smartphones for long periods of work as far as possible. One workable arrangement is to raise the screen and keep the external keyboard separate, in front of you.

For adults: screen at least 40 cm away, top of the screen at eye level or slightly below, upper arm to forearm at 90 degrees or more, soles flat on the floor. For children: at least 30 cm, and look into the distance for 20 seconds or more once every 30 minutes. Those are the official numbers.

Whether to float or rest your wrists is not settled by official guidance. Decide by whether your hand is straight, your shoulders are loose, and no edge is pressing in.

If pain or numbness lasts, see a medical professional before adjusting your posture.

I checked the figures and wording in this article against the documents below on October 18, 2026. The two Japanese government documents are in Japanese. Page numbers are PDF page numbers.

1. Ministry of Health, Labour and Welfare (Japan), Guideline for Occupational Health Management in Information Device Work (Notification 0712-3, July 12, 2019; partly revised by Notification 1201-7, December 1, 2021), text and commentary — text pp. 6–9, commentary pp. 21–25
2. Ministry of Education, Culture, Sports, Science and Technology (Japan), Guidebook for Using ICT with Attention to Students' Health (revised March 2022) — pp. 8–11 (using tablets, Q&A)
3. US Occupational Safety and Health Administration, Computer Workstations eTool: Working Positions — elbow angle; position of hands, wrists, and forearms
4. US Occupational Safety and Health Administration, Computer Workstations eTool: Keyboards — wrist rest edges; keyboard feet
5. Feit AM, Weir D, Oulasvirta A. How We Type: Movement Strategies and Performance in Everyday Typing. CHI 2016. — hand motion and speed (Abstract, Discussion)
6. The break reminder's behavior comes from Typing Musou's settings screen and code (as of October 18, 2026)