Limit switch

A limit switch, comprising:

• a switch main body;
• and
• an operation unit connected to the switch main body, wherein
• the operation unit includes:
• a housing;
• a shaft member extending from an outside of the housing to an inside of the housing along a first direction and supported by the housing in a state rotatable from a return position to an operation position around a rotation axis extending in the first direction;
• and
• an urging portion positioned inside the housing and biasing the shaft member in a second direction intersecting the first direction and in a direction approaching the switch main body to return the shaft member to the return position, and
• the urging portion includes:
• an elastic member stretchable along a center line extending in the second direction and configured to bias the shaft member;
• a return plunger positioned between the elastic member and the shaft member in the second direction, movable along the center line, and configured to transmit a biasing force of the elastic member to the shaft member;
• and
• a guide member attached to the housing, configured to accommodate the return plunger inside the guide member and to guide movement of the return plunger, and having higher heat resistance than the housing.