Patent ID: 8028575

Claim:
A liquid level detecting device provided to a container for storing fluid, the liquid level detecting device comprising: a rotative member including a bearing portion having a hole; a stationary member having an axis portion fitted to the hole of the bearing portion and rotatably holding the rotative member; a displacement member fixed to the rotative member and rotative integrally with the rotative member; a detection unit fixed to the stationary member and configured to detect a position of the displacement member so as to detect a liquid level of the fluid in the container; a float configured to float in the fluid; an arm fixed to the float at one end and fixed to the rotative member at an other end, the arm being configured to convert a vertical motion of the float to a rotary motion of the rotative member, wherein the axis portion has an inserted portion inserted in the bearing portion, the inserted portion is in contact with the bearing portion via a contact portion, and the contact portion has a total area that is less than an area of an outer circumferential periphery of the inserted portion, the axis portion has an outer circumferential periphery provided with a plurality of protrusions that provide said contact portion, each of the plurality of protrusions is in the shape of a ring extending in the circumferential direction of the axis portion, and the plurality of protrusions are spaced apart from each other in an axial direction of the axis portion.