Thermostat device

A thermostat device, comprising,

• a housing inside which a valve seat is formed;
• a thermo-element having one end disposed inside the housing and performing an expanding/contracting operation in response to a temperature;
• a valve body provided on an outer periphery of the thermo-element and being seated on and separated from the valve seat by the expanding/contracting operation of the thermo-element;
• a biasing member biasing the valve body toward the valve seat;
• and
• a frame supporting one end of the biasing member,
• wherein the housing comprises a hollow body having an opening at one end and having the valve seat formed therein, a pair of legs standing up from an opening edge of the hollow body, and a hooking portion hooking on the frame is formed to protrude inward at the tip end of the leg,
• wherein the hooking portion includes an engaged portion located at a center of a lateral width direction of the leg and auxiliary portions located on both ends of the lateral width direction of the leg, continuous with the engaged portion;
• an end face of a root side of the leg at the engaged portion is located at a distal position from the tip end of the leg compared to an end face of the root side of the leg at the auxiliary portion;
• and the frame is in contact with the end face of the engaged portion, and
• wherein the frame is provided with a mounting board in contact with the end face of the engaged portion and a pair of side plates standing opposite to each other from both ends in a width direction of the mounting board, and of the engaged portion and the auxiliary portion which are constituting the hooking portion, the engaged portion is fitted between the pair of side plates.