A production method of rotary electric machines is provided that can laser weld the leading end parts of a plurality of electrical conductors projecting from respective slots with high joint strength. A production method of rotary electric machines that produces a rotary electric machine by joining, by way of laser welding, leading end parts of a plurality of electrical conductors inserted in respective slots provided in a stator core and projecting from the respective slots, includes the steps of matching and arranging the leading end parts of two adjacent electrical conductors; and joining the leading end parts of the two adjacent electrical conductors by irradiating a laser onto the two adjacent electrical conductors from a direction sloped at an angle relative to a joining face of the leading end parts of the two adjacent electrical conductors.