INPUT DEVICE

PROBLEM TO BE SOLVED: To provide an input device which prevents a liquid intruding into a gap between a substrate and a key member due to capillary phenomenon from reaching an electric circuit pattern.SOLUTION: An input device 10 includes a first substrate 20 and a first key member 40. An electric circuit pattern 81 is formed in the first substrate 20 so as to be spaced a predetermined insulation distance away from a periphery 21A of a pattern surface 21. The first key member 40 includes: a sheet part 41 covering an insulation region of the first substrate 20; and a key part 42 protruding from the sheet part 41. A facing surface 92 facing the insulation region of the first substrate 20 and a second groove 93 recessed from the facing surface 92 are provided in the sheet part 41. The second groove 93 is provided at a position which is covered by the first substrate 20.