PURPOSE:To improve the airtightness of a compression chamber and improve compression efficiency by providing a ring-shaped plate on the inner periphery on the upper end plate side of the piston of a rolling piston type rotary compressor. CONSTITUTION:A ring-shaped plate 7b having a width which allows a piston 7a to rotate is provided on the end inner periphery on the upper end plate 4 side of the piston 7a of a rolling piston type rotary compressor. Accordingly, the contact area between the inner wall face of the upper end plate 4 and the side face of the piston 7a is increased, and the airtightness of a compression chamber is made excellent and compression efficiency can be improved.
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