PURPOSE: To sterilize an input device with no intervention of man power by preparing a sterilizable space in an information processor.

CONSTITUTION: An information processor is provided with a storing space 1c, a storing space 24, a sterilizer lamp (e) and a sensor (h). When a keyboard (a) and a mouse (b) serving as the input devices are stored in the spaces 1c end 2d respectively and a door is closed, the sensor (h) detects the storage of the keyboard (a) and the mouse (b) end the lamp (e) is automatically turned on. Then the lamp (e) is automatically turned off after 8 prescribed sterilizing time set by a timer.