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 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 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 on the movable ladder , the first hydraulic cylinder supporting the movable ladder together with the trajectory restricting member and the cooperative rod member , the first hydraulic cylinder switching, by moving the pivotally supported part in common with the pivotally supported part of the cooperative rod member in cooperation with the cooperative rod member , 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 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 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 on the movable ladder , the first hydraulic cylinder supporting the movable ladder together with the trajectory restricting member and the cooperative rod member , the first hydraulic cylinder switching, by moving the pivotally supported part in common with the pivotally supported part of the cooperative rod member in cooperation with the cooperative rod member , 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. <EOS>