Electromagnetic relay and electromagnetic device

An electromagnetic device comprising:

• an electromagnet including a coil and a yoke;
• an armature;
• a permanent magnet including poles one of which faces the armature;
• and
• an auxiliary yoke including a first surface which faces the other of the poles of the permanent magnet, and a second surface facing the yoke;
• and
• a base having a main surface and holding the electromagnet over the main surface, wherein:
• the armature is configured to move toward or away from the yoke when the electromagnet is excited,
• the permanent magnet is disposed between the armature and the auxiliary yoke,
• the second surface of the auxiliary yoke is adjacent to the first surface of the auxiliary yoke and a normal direction of the second surface crosses a normal direction of the first surface, the yoke includes:
• a first part around which the coil is disposed, the first part being disposed not to overlap with the armature when viewed from the normal direction of the first surface;
• a second part extending from the first part toward the armature to overlap with the armature and extending along an arrangement direction where the armature and the first part are arranged, when viewed from the normal direction of the first surface;
• and
• a third part disposed such that the first part is interposed between the second part and the third part when viewed from the first part, the third part extending from the first part toward the armature to overlap with the armature and extending along the arrangement direction, when viewed from the normal direction of the first surface, and
• the second surface of the auxiliary yoke faces either the second part or the third part of the yoke in a range of at least part of a movable range of the armature moving in response to the excitation, and
• the permanent magnet is placed between the base and the armature in an arrangement direction in which the base and the electromagnet are arranged.