Liquid level detection device

A liquid level detection device provided with a fixed body fixed to a container and a rotating body rotating relative to the fixed body, and detecting a liquid level of a liquid stored in the container using a relative angle of the rotating body relative to the fixed body, comprising:

• a float floating in the liquid;
• and
• an arm connecting the rotating body and the float and allowing the rotating body to rotate with up and down motions of the float, wherein
• the arm has an insertion portion to be inserted into the rotating body and an extending portion extending straight and bent relative to the insertion portion, and
• the rotating body has
• an insertion hole in which the insertion portion of the arm is inserted in an insertion direction,
• a holding portion having a receiving opening receiving the extending portion in an intersecting direction intersecting with the insertion direction and holding the extending portion received by the receiving opening,
• a stopper having an end face facing an opposite direction to the insertion direction and releasing the receiving opening by moving in the insertion direction due to elastic deformation from a blocking state in which the end face blocks the receiving opening, and
• a protruding wall disposed on an opposite side to the holding portion with the stopper in between and protruding in the opposite direction beyond the end face in the blocking state.