Rotating electrical machine

A rotating electrical machine comprising:

• a stator core having a slot;
• a stator coil formed by a plurality of coil pieces and wound around the stator core, the plurality of coil pieces including a general portion in which a conductor is covered with an insulating film and a conductor exposed portion in which the insulating film is removed and the conductor is exposed, the stator coil being formed by joining the conductor exposed portions at end portions of the plurality of coil pieces;
• and
• an insulating material portion provided so as to cover the conductor exposed portion, wherein
• paired conductor exposed portions to be joined to each other among the conductor exposed portions of the plurality of coil pieces include paired non-joint portions that are continuous with joint portions and face each other,
• the insulating material portion includes a first insulating material portion formed on one surface of facing paired surfaces of the paired non-joint portions and a second insulating material portion formed on the other surface, and
• a gap is formed between the first insulating material portion and the second insulating material portion.