To provide an electronic nit a casing, where satisfactory functional properties and operability are ensured and new designs can be realized.

An electronic unit, constituted of a unit main body and a casing 100 storing the unit main body, has plural types of init elements 310, 320 and 330 for inputting and outputting information with an outer part. The casing 100 has plural shapes surrounded by plural faces and has a projecting/recessed pattern 120, where plural projected wires 121 extending in the same direction, are arranged on at least one face. The projected wires 121 are arranged in the same direction and opening parts 131, 132 and 133 corresponding to at least one unit element among the plural unit elements are arranged on one face. Two sides 131a, 131b, 132a, 132b, 133a and 133b among the edges of the opening parts 131, 132 and 133 are arranged in the same direction as the projected strip 121.