A scroll-type compressor includes a fixed scroll member having a first spiral element, and an orbiting scroll member having a second spiral element. The first spiral element and the second spiral element interfit with each other at an angular offset and at a radial offset to form a plurality of fluid pockets which, are adapted to compress a fluid. Further, the first spiral element or the second spiral element, or both, include an interior wall surface defined by a first involute curve based on a circle, an exterior wall surface defined by a second involute curve based on the circle, an end wall surface formed at a center end of the spiral element by a first arc, and a fillet formed along a root of the end wall surface. Moreover, apportion of the fillet is formed by a second arc, and a line which is tangent to the circle and intersects the second involute curve includes a center of curvature of the first arc and a center of a curvature of the second arc.