To virtually experience the feeling of operating a motorbike, or the like, and to increase a realistic feel by adding an accelerator key to the grip portions of a computer game controller.

A rotation detecting means 9 and a shaft 13 are disposed within either of grip portions 3 formed in the housing 2 of the computer game controller, with one end of the shaft connected to the detecting means 9 and the other end secured to the accelerator key 10 which is formed to be rotatable relatively to the one grip portion 3. An analog output is provided depending on a change in resistance value of the detecting means 9 due to the rotation of the shaft 13.