A push button switch (SW, SW1a, SW1 b, SW2, SW3) comprising: a switch main body (1, 11 a, 11 b, 12, 13) comprising a movable section (10, 101 a, 101 b, 102, 103) configured to be displaced downward by a pressure to bring a movable contact into contact with a fixed contact, the movable section (10, 101 a, 101 b, 102, 103) being configured to be displaced upward to release contact between the contacts upon release of the pressure; a button section (2, 21 a, 21 b, 22, 23) configured to press an upper surface of the movable section (10, 101 a, 101 b, 102, 103) in response to a downward pressing operation; and a support arm (3, 31 a, 31 b, 32, 33) whose one end portion is coupled to the button section (2, 21 a, 21 b, 22, 23), and whose other end portion is attached to a support surface provided along a vertical direction such that the support arm (3, 31 a, 31 b, 32, 33) is turnable, the support arm (3, 31 a, 31 b, 32, 33) supporting the button section (2, 21 a, 21 b, 22, 23) such that when the button section (2, 21 a, 21 b, 22, 23) is not subjected to the downward pressing operation, the button section (2, 21 a, 21 b, 22, 23) is separated from the movable section (10, 101 a, 101b, 102, 103), wherein the end portion of the support arm (3, 31 a, 31 b, 32, 33) in the side not coupled to the button section (2, 21 a, 21 b, 22, 23) is attached to the support surface while positioned laterally or obliquely downward with respect to a moving range of an upper surface of the movable section (10, 101 a, 101 b, 102, 103), characterized in that an inclination angle of a bottom surface of the button section (2, 21 a, 21 b, 22, 23) is set such that the bottom surface constitutes an inclined surface while being not subjected to the downward pressing operation and when the bottom surface of the button section (2, 21 a, 21 b, 22, 23) contacts the upper surface of the movable section (10, 101 a, 101 b, 102, 103) prior to the movable contact being brought into contact with the fixed contact, and such that the bottom surface becomes substantially horizontal when the movable section (10, 101 a, 101 b, 102, 103) is pressed to a position where the movable contact and the fixed contact are brought into contact with each other. a switch main body (1, 11 a, 11 b, 12, 13) comprising a movable section (10, 101 a, 101 b, 102, 103) configured to be displaced downward by a pressure to bring a movable contact into contact with a fixed contact, the movable section (10, 101 a, 101 b, 102, 103) being configured to be displaced upward to release contact between the contacts upon release of the pressure; a button section (2, 21 a, 21 b, 22, 23) configured to press an upper surface of the movable section (10, 101 a, 101 b, 102, 103) in response to a downward pressing operation; and a support arm (3, 31 a, 31 b, 32, 33) whose one end portion is coupled to the button section (2, 21 a, 21 b, 22, 23), and whose other end portion is attached to a support surface provided along a vertical direction such that the support arm (3, 31 a, 31 b, 32, 33) is turnable, the support arm (3, 31 a, 31 b, 32, 33) supporting the button section (2, 21 a, 21 b, 22, 23) such that when the button section (2, 21 a, 21 b, 22, 23) is not subjected to the downward pressing operation, the button section (2, 21 a, 21 b, 22, 23) is separated from the movable section (10, 101 a, 101b, 102, 103),