<p>Provided is an armature core that can be easily used under a high temperature environment or even under such an environment that the armature core is in contact with a cooling medium. Teeth (10) are circularly disposed around a rotational axis (P). A yoke (20) has a through-hole (21). The through-hole (21) opens in a radial direction centered on the rotational axis (P) and in an axial direction along the rotational axis (P). The teeth (10) are inserted into the through-hole (21). A metal plate (30) is disposed so as to face the yoke (20) in the axial direction. A reinforcing plate (30) is fixed to the teeth (10).</p>
