A three-phase rotary electrical machine including a stator including a stator core including split cores, a rotor, a bobbin attached to each of the split cores, a winding being wound around each split core to which the bobbin is attached, and a bobbin unit including three of the bobbins which are arranged in a circumferential direction of a rotation axis as one unit, wherein the bobbin positioned at a center of the bobbin unit are formed in a bendable manner integrally with the bobbins positioned adjoining to the bobbin positioned at the center, the bobbin unit is sealed with the bobbin unit positioned adjoining thereto, and a cooling passage extending in the axial direction is provided at each clearance between the windings for three phases.