A contact device comprising: a movable contact including a plate-like contact base and a contact body upstanding from an end of the contact base; and a holder constructed to hold the contact base of the movable contact, the holder including: a first holding portion (31 a) constructed to hold the contact base, the first holding portion being in contact with one surface of the contact base, the surface being opposite an other surface of the contact base from which the contact body upstands, a second holding portion constructed to hold the contact base, the second holding portion being in contact with the other surface of the contact base at a distal end of the contact base, the distal end being distal with reference to the contact body, and a disengagement-prevention portion residing above a proximal end of the contact base, the proximal end being proximal with reference to the contact body, and the disengagement-prevention portion being configured to prevent the movable contact from being detached from the holder, and a protruding section is provided at the proximal end of the contact base with reference to the contact body, wherein when the contact base is inclined, abutment of the protruding section (21 a) against the disengagement-prevention portion ensures prevention of the disengagement from the holder, characterized in that the disengagement-prevention portion and the protruding section (21 a) are spaced from and opposed to each other in an upstanding direction. a movable contact including a plate-like contact base and a contact body upstanding from an end of the contact base; and a holder constructed to hold the contact base of the movable contact, the holder including: a first holding portion (31 a) constructed to hold the contact base, the first holding portion being in contact with one surface of the contact base, the surface being opposite an other surface of the contact base from which the contact body upstands, a second holding portion constructed to hold the contact base, the second holding portion being in contact with the other surface of the contact base at a distal end of the contact base, the distal end being distal with reference to the contact body, and a disengagement-prevention portion residing above a proximal end of the contact base, the proximal end being proximal with reference to the contact body, and the disengagement-prevention portion being configured to prevent the movable contact from being detached from the holder, and a protruding section is provided at the proximal end of the contact base with reference to the contact body, a first holding portion (31 a) constructed to hold the contact base, the first holding portion being in contact with one surface of the contact base, the surface being opposite an other surface of the contact base from which the contact body upstands, a second holding portion constructed to hold the contact base, the second holding portion being in contact with the other surface of the contact base at a distal end of the contact base, the distal end being distal with reference to the contact body, and a disengagement-prevention portion residing above a proximal end of the contact base, the proximal end being proximal with reference to the contact body, and the disengagement-prevention portion being configured to prevent the movable contact from being detached from the holder, and a protruding section is provided at the proximal end of the contact base with reference to the contact body,