Wireless input device for computer

A wireless input device for computer comprises a pen-type input device 5 having a source of light capable of transmitting pulses. The wireless input device further comprises an input device body 4 including two angle detecting sections, each having a light receiving element constructed so that it is directed to the direction of incident light when the incident light from said source of light is detected, and a calculating section for calculating the position of the pen-type input device from the two incident angles detected by the two angle detecting sections.