To provide a button aggregation which is thin, light and easy to manufacture, transmits light emitted from the inside of a device and can identify buttons.

This button set 10 is constituted by combining a large number of buttons 20 with a single film 18. A large number of protrusions 28 for forming button molding spaces are formed to the film 18. Respective buttons 20 with contact bosses 24 are injection-molded and combined in the button molding spaces. The buttons 20 have side walls 34 formed by thickness cutting grooves 32 and contacting with the protrusions 28 of the film 18. The side walls 34 get thinner toward the downside.