A switch comprising: a manipulator supported by a housing and adapted to swing on one side and the other side; a power switch mechanism (130, 160, 170) adapted to bring contact portions (166, 167, 176, 177) of a movable piece (162, 172) and a fixed terminal (163, 173) into contact with each other when the manipulator is swung onto the one side, wherein the movable piece (162, 172) and the fixed terminal (163, 173) are disposed opposite each other in the housing; and a power retaining and releasing mechanism portion including a returning spring and a power retaining and releasing mechanism; wherein the returning spring is adapted to bias the manipulator in a swing manipulation direction in which the manipulator is swung onto the other side, the power retaining and releasing mechanism includes a retaining portion (153, 153a) and a releasing portion, wherein the retaining portion (153, 153a) is adapted to regulate a restoring force of the returning spring according to the swing manipulation of the manipulator onto the one side to retain a contact state of the contact portions (166, 167, 176, 177) of the movable piece (162, 172) and the fixed terminal (163, 173), and the releasing portion is adapted to release the contact state retained by the retaining portion (153, 153a), and the housing includes a stacked attachment portion, the manipulator being mounted on the upper surface of the housing such that the returning spring and the power retaining and releasing mechanism are attached on a lower side of the other side of the manipulator and stacked in the stacked attachment portion, characterized in that the power retaining and releasing mechanism portion is detachably attached on the lower side of the other side of the manipulator such that the power retaining and releasing mechanism portion can be drawn from and inserted into the stacked attachment portion from a bottom of the stacked attachment portion of the housing on a lower side of the housing with respect to the upper surface of the housing. a manipulator supported by a housing and adapted to swing on one side and the other side; a power switch mechanism (130, 160, 170) adapted to bring contact portions (166, 167, 176, 177) of a movable piece (162, 172) and a fixed terminal (163, 173) into contact with each other when the manipulator is swung onto the one side, wherein the movable piece (162, 172) and the fixed terminal (163, 173) are disposed opposite each other in the housing; and a power retaining and releasing mechanism portion including a returning spring and a power retaining and releasing mechanism; wherein the returning spring is adapted to bias the manipulator in a swing manipulation direction in which the manipulator is swung onto the other side, the power retaining and releasing mechanism includes a retaining portion (153, 153a) and a releasing portion, wherein the retaining portion (153, 153a) is adapted to regulate a restoring force of the returning spring according to the swing manipulation of the manipulator onto the one side to retain a contact state of the contact portions (166, 167, 176, 177) of the movable piece (162, 172) and the fixed terminal (163, 173), and the releasing portion is adapted to release the contact state retained by the retaining portion (153, 153a), and the housing includes a stacked attachment portion, the manipulator being mounted on the upper surface of the housing such that the returning spring and the power retaining and releasing mechanism are attached on a lower side of the other side of the manipulator and stacked in the stacked attachment portion, characterized in that the power retaining and releasing mechanism portion is detachably attached on the lower side of the other side of the manipulator such that the power retaining and releasing mechanism portion can be drawn from and inserted into the stacked attachment portion from a bottom of the stacked attachment portion of the housing on a lower side of the housing with respect to the upper surface of the housing.