Patent ID: 8136645

Claim:
A rotary damper comprising: a housing; an annular ring member that is provided in the housing, and wherein the annular ring member is made of elastomer or flexible rubber; a shaft body that is accommodated in a rotatable manner in the housing; and a sliding portion attached to the shaft body, wherein the sliding portion is provided in the housing and makes contact with the ring member so as to slide with respect to the annular ring member along a circumferential direction of the annular ring member, wherein: the annular ring member has an abutting portion that abuts the sliding portion, and forms a hollow portion provided inside the annular ring member; the annular ring member has an opening portion on the side opposite to the abutting portion; a projected portion is provided on an inner surface of the housing; the opening portion engages opposite sides of the projected portion such that a gas is hermetically sealed in the hollow portion by the annular ring member and the projected portion; and at least one pressing member presses the ring member toward the inner surface of the housing, wherein the at least one pressing member is provided on an inner side and/or an outer side of the annular ring member in a radial direction of the annular ring member.