A rotary switch device defining a rotation axis (RA) and comprising: a terminal base to which a center portion contact and a fixed contact are fixed; a rotation operation member ; a plate-like movable contact member which includes a contact part which is pressed in contact with the center portion contact at one end of one surface of plate thickness surfaces and a contact surface which is in contact with the fixed contact at another end of the one surface of the plate thickness surfaces, and wherein the movable contact member is held in the rotation operation member so as to short-circuit between the center portion contact and the fixed contact at a conductive rotation position; and a compression coil spring in which one end is supported by a bottom surface of a spring accommodation hole formed in the rotation operation member and another end is pressed in contact with a back surface against a plate thickness surface forming the contact part and the contact surface of the movable contact member so as to urge the contact part and the contact surface towards the terminal base in the axial direction of the rotation axis (RA), characterized in that : the rotation operation member is operable to rotate on the rotation axis (RA) around the center portion contact with respect to the terminal base , and in that the contact part of the movable contact member is a contact protrusion part which protrudes in direction opposite from the back surface of the movable contact member , and which is pressed in contact with the center portion contact by the compression coil spring being of a barrel type. a terminal base to which a center portion contact and a fixed contact are fixed; a rotation operation member ; a plate-like movable contact member which includes a contact part which is pressed in contact with the center portion contact at one end of one surface of plate thickness surfaces and a contact surface which is in contact with the fixed contact at another end of the one surface of the plate thickness surfaces, and wherein the movable contact member is held in the rotation operation member so as to short-circuit between the center portion contact and the fixed contact at a conductive rotation position; and a compression coil spring in which one end is supported by a bottom surface of a spring accommodation hole formed in the rotation operation member and another end is pressed in contact with a back surface against a plate thickness surface forming the contact part and the contact surface of the movable contact member so as to urge the contact part and the contact surface towards the terminal base in the axial direction of the rotation axis (RA), characterized in that : the rotation operation member is operable to rotate on the rotation axis (RA) around the center portion contact with respect to the terminal base , and in that the contact part of the movable contact member is a contact protrusion part which protrudes in direction opposite from the back surface of the movable contact member , and which is pressed in contact with the center portion contact by the compression coil spring being of a barrel type. the rotation operation member is operable to rotate on the rotation axis (RA) around the center portion contact with respect to the terminal base , and in that the contact part of the movable contact member is a contact protrusion part which protrudes in direction opposite from the back surface of the movable contact member , and which is pressed in contact with the center portion contact by the compression coil spring being of a barrel type. <EOS>