<p>In a sealed compressor, a circular tube-shaped hole section (117) which forms a compression chamber (115) has a tapered section (127) formed in such a manner that the inner diameter of the tapered section (127) increases from the side on which a piston (123) is positioned at the upper dead center toward the side on which the piston (123) is positioned at the bottom dead center. The piston (123) is configured so that the direction of tilt thereof changes relative to the axis of the hole section (117) in the initial period of a compression stroke. As a result, the strength of contact between the piston (123) and the hole section (117) when the piston (123) changes the direction of tilt thereof is lower than the strength of the contact when the piston (123) changes the direction of tilt thereof in and after the middle period of the compression stroke. This makes the sealed compressor highly reliable and allows the sealed compressor to achieve reduced noise levels.</p>
