This micro relay comprises a body 1, a cover 4, an armature block 3. The body 1, which is made of silicon or glass, has an electromagnetic mechanism 2. The cover 4 is also made of silicon or glass. The armature block 3 is made of silicon. The armature block 3 is composed of an armature base 30 and a frame 31. The frame 31 surrounds an entire circumference of the armature base 30 and supports the armature base 30 pivotally. The armature base 30 is cooperative with a magnetic material 32 on a surface of the armature base 30 to define an armature 300. A fixed contacts 14A, 14B, 15A, 15B and movable contacts 33A, 33B are selectively closed and opened by a pivot motion of the armature 300. And, the frame 31 is directly bonded over its entire circumference to a periphery 19 of the body 1 and to a periphery 41 of the cover 4 to define a sealed space surrounded by the frame 31 and closed between the body 1 and the cover 4 for accommodating the armature 300 and the fixed contacts and the movable contacts.