Scroll type fluid machine

A scroll type fluid machine comprising an unorbiting scroll member having a spiral scroll lap and performing limited motion in a plane orthogonal to the axis thereof;

• an orbiting scroll having a spiral scroll lap meshed with the scroll lap of the unorbiting scroll member so as to define compression chambers and performing orbiting motion without rotation around its axis in the plane orthogonal to the axis, an unorbiting scroll fixing member for unmovably fixing the unorbiting scroll member after the unorbiting scroll member and the unorbiting scroll fixing member are positioned in a positional relationship for assembly, and a positioning means for positioning relative positions of the unorbiting scroll member and the unorbiting scroll fixing member in the plane orthogonal to the axis for assembly before the unorbiting scroll member is fixed to the unorbiting scroll fixing member, characterized in that
• the positioning means comprises parts formed in both the unorbiting scroll fixing member and the unorbiting scroll member, and is adapted to mesh the unorbiting scroll member with the unorbiting scroll fixing member in the positional relationship for assembly, the positioning means permitting the unorbiting scroll member and the unorbiting scroll fixing member to have two motions relative to one another, one motion in a direction along a one straight line passing through a substantial center of the unorbiting scroll member in the plane orthogonal to the axis, and another motion rotatable about a straight line extending through a position on the one straight line around a peripheral edge of the unorbiting scroll member, in parallel with the axis.