Hot water tank for bidet and bidet device including the same

A hot water tank for a bidet, the hot water tank comprising:

• a tank main body in which a space for accommodating water is formed and an inclined surface having a portion of an upper side inclined downward is formed;
• a heating unit inserted into and positioned in the tank main body;
• a bimetal positioned on the inclined surface;
• a fastening member configured to couple the bimetal to the tank main body and being inserted into an inside of the tank main body from an outside of a periphery of the bimetal so that the bimetal is coupled to the tank main body;
• a protrusion formed on an inner circumferential surface of an upper part of the tank main body by using the fastening member;
• and
• a bubble preventing portion positioned at a stepped portion formed between the protrusion and the inner circumferential surface of the upper part of the tank main body.