A liquid level detecting device includes a rotative member having a bearing portion and a stationary member having an axis portion. The axis portion is fitted to a hole of the bearing portion, thereby rotatably holding the rotative member. The rotative member is integrated with a displacement member. The stationary member is fixed with a detection unit to detect a displacement of the displacement member. The rotative member is connected with a float via an arm. The axis portion has an inserted portion inserted in the bearing portion and in contact with the bearing portion via a contact portion. The contact portion has a total area that is less than an area of an outer circumferential periphery of the inserted portion.