Operation switch, medical device provided with operation switch, and endoscope provided with operation switch

An operation switch comprising:

• a holding base;
• a switch main body disposed inside the holding base, the switch main body comprising a tubular protrusion extending in a longitudinal direction, the tubular protrusion forming a hole inside;
• a pressing body disposed in the hole and configured to move along the longitudinal direction to press an electric switch;
• and
• an elastic cover configured to cover the switch main body and the pressing body, the elastic cover comprising:
• a dome portion provided to a first side of the elastic cover;
• and
• a flange provided to a second side of the elastic cover,
• wherein the dome portion comprises a first inclined surface pressed inward of the holding base to be deformed with a tension,
• a ring comprising a first ring portion provided on the switch main body, and a second ring portion provided on the holding base,
• wherein a second inclined surface of the elastic cover is pressed by the second ring portion to deform with a tension.