電腦鍵盤是輸入文字最重要的設備，不當的鍵盤設計會造成尺偏、撓偏等現象；其中設計鍵 盤的要素中，以按鍵大小為最主要的影響因素。本研究探討鍵盤之按鍵尺寸大小之設計，提升工 作效率並避免造成操作上之病變。本實驗一開始，隨機抽樣49 位使用者，調查鍵盤按鍵尺寸以及 食指寬度。其中，國人的手指頭寬度在1.3±0.01cm；一般鍵盤按鍵尺寸為1.3±0.1cm 與1.5±0.01cm， 透過人因實驗計測1.3*1.5cm、1.5*1.5cm、1.2*1.4 cm 按鍵尺寸，探討最佳鍵盤按鍵尺寸。 本研究結果透過單因子變異數統計分析得到：在打字效率上，1.2*1.4 cm ＞ 1.3*1.5cm ＞ 1.5*1.5cm；在打字錯誤率上，三款按鍵尺寸沒有顯著性的差異。透過本實驗的研究數據，提供給 設計鍵盤之人以及學者參考。

Keyboard is the most important equipment for computer appliance.However, improper design of keyboard will cause some symptom likeUlnardeviation and Radial deviation. My research goal is discovering the most suitable size of keys to promote the working efficiency as a simple conference. At the beginning, I picked 49 subjects randomly, investigating of the total length, width, the size of the letter key, the index finger width, and thickness of the keyboard. Among all subjects, the letter keys 1.3 * 1.3cm and 1.5 * 1.5cm are the most common. Then I chose 18 samples randomly to operating three kinds of keyboard (1.3 * 1.5cm, 1.2 * 1.4 cm, 1.5 * 1.5cm) in one minute to the most suitable size of keys. The resultreveals thatthe efficiency of size 1.3 * 1.5cm and 1.2 * 1.4 cm is similar, but 1.5 * 1.5cm is obviously typing inefficient. As for typing error rate, there is no significant difference.