Patent ID: 8628315

Claim:
A fluid machine comprising: a housing; a fixed scroll fixed with respect to the housing; a turning scroll that revolves around the fixed scroll; and a rotation preventing mechanism that prevents a rotation of the turning scroll, wherein the rotation preventing mechanism includes a rotation preventing pin projected from a wall surface at a side of the housing or a side of the turning scroll and a restraining member that restricts a position of the rotation preventing pin by engaging with the rotation preventing pin, the restraining member has a cylinder shape and is disposed inside an insertion hole formed on the wall surface of the housing, and the rotation preventing pin includes a projecting portion including both a taper-shaped portion formed on a projecting side end thereof and a columnar-shaped portion, and the projecting portion is positioned inside the restraining member such as the projecting portion slidingly contacts with an inner peripheral surface of the restraining member, and the taper shaped portion of the rotation preventing pin changes in stages, wherein the stages comprise a first stage having a first length and a second stage having a second length.