A lifting and lowering device for a construction machine, the lifting and lowering device comprising: a supporting member being attachable to a revolving body of the construction machine; a movable ladder having steps allowing an operator to climb up and down; a trajectory restricting member whose one end is pivotally supported on the supporting member in a swingable manner and whose another end is pivotally supported on the movable ladder in the swingable manner, the trajectory restricting member restricting a movement trajectory of a pivotally supported part at the other end to be of a shape of an arc with a pivotally supported part at the one end as a center; and a cooperative rod member (21, 31) whose one end is pivotally supported on the supporting member in the swingable manner and whose another end is pivotally supported in the swingable manner in a position being away from the pivotally supported part of the trajectory restricting member on the movable ladder; characterized by a first hydraulic cylinder whose one end is pivotally supported in the swingable manner in a position being away from a pivotally supported part of the cooperative rod member (21, 31) on the supporting member and whose another end is pivotally supported in the swingable manner in a position in common with a position of the pivotally supported part of the cooperative rod member (21, 31) on the movable ladder, the first hydraulic cylinder supporting the movable ladder together with the trajectory restricting member and the cooperative rod member (21, 31), the first hydraulic cylinder switching, by moving the pivotally supported part in common with the pivotally supported part of the cooperative rod member (21, 31) in cooperation with the cooperative rod member (21, 31), a position of the movable ladder between a retracted position in which the movable ladder is retracted to a side of the revolving body and an extended position in which the operator on a ground surface is allowed to climb up and down. a supporting member being attachable to a revolving body of the construction machine; a movable ladder having steps allowing an operator to climb up and down; a trajectory restricting member whose one end is pivotally supported on the supporting member in a swingable manner and whose another end is pivotally supported on the movable ladder in the swingable manner, the trajectory restricting member restricting a movement trajectory of a pivotally supported part at the other end to be of a shape of an arc with a pivotally supported part at the one end as a center; and a cooperative rod member (21, 31) whose one end is pivotally supported on the supporting member in the swingable manner and whose another end is pivotally supported in the swingable manner in a position being away from the pivotally supported part of the trajectory restricting member on the movable ladder; characterized by a first hydraulic cylinder whose one end is pivotally supported in the swingable manner in a position being away from a pivotally supported part of the cooperative rod member (21, 31) on the supporting member and whose another end is pivotally supported in the swingable manner in a position in common with a position of the pivotally supported part of the cooperative rod member (21, 31) on the movable ladder, the first hydraulic cylinder supporting the movable ladder together with the trajectory restricting member and the cooperative rod member (21, 31), the first hydraulic cylinder switching, by moving the pivotally supported part in common with the pivotally supported part of the cooperative rod member (21, 31) in cooperation with the cooperative rod member (21, 31), a position of the movable ladder between a retracted position in which the movable ladder is retracted to a side of the revolving body and an extended position in which the operator on a ground surface is allowed to climb up and down.