Patent ID: 8692775

Claim:
A key structure of an operation section of an electronic device having a plurality of operation keys arranged in parallel in a manner to be adjacent to one another comprising: an operation portion having a step height formed in the operation key that performs input operations by being pressed down with a finger of an operator, wherein said operation portion of said operation key comprises a higher step surface located in a higher level portion in a pressed-down direction and a lower step surface formed at least on an adjacent side where said operation keys are adjacent to one another in a level portion lower than said higher step surface in said pressed-down direction, wherein said higher step surface and said lower step surface are formed so as to be approximately planar surfaces being parallel to each other and a width of said lower step surface is set to be not less than a half of an error width of said press-down operation as a width in an adjacent direction with respect to said higher step surface; and wherein the step height between said higher step surface and said lower step surface is set to be not less than a press-down height required for said input operations.