In a compressor having a discharge valve mechanism, a valve retainer has a
curved surface which is faced to and spaced from a movable portion of a
flexible plate-like discharge valve and adapted to limit the movement of
the movable portion. In a first direction parallel to the valve plate,
the movable portion extends from a fixed portion, fixed to a valve plate,
to face an exit end of a discharge hole of the valve plate. The curved
surface has a plurality of parts different in radius of curvature from
one another in a second direction parallel to the valve plate and
perpendicular to the first direction.