A construction machine comprising: a lower travelling body configured to move on ground; and an upper slewing body supported by the lower travelling body in a slewable manner, wherein the lower travelling body includes: a truck frame including a front surface part and a rear surface part, the truck frame supporting the upper slewing body; one pair of left and right side frames (511, 521) each supporting a crawler that allows circling movement, the one pair of left and right side frames (511, 521) being respectively coupled to both ends of a left and right direction of the truck frame to extend in a front and rear direction more than the truck frame; one pair of front and rear travelling body weights (53, 54) each including a weight upper surface part facing upward and one pair of left and right weight side surfaces (60L, 60R) respectively disposed facing the one pair of left and right side frames (511, 521), the one pair of front and rear travelling body weights (53, 54) being respectively disposed on a front side and a rear side of the truck frame between the one pair of left and right side frames (511, 521); and at least one pair of front and rear scaffolding members each including a scaffolding upper surface part facing upward, characterized by the at least one pair of front and rear scaffolding members being respectively installed in the one pair of front and rear travelling body weights (53, 54) to project to sides of the side frames (511, 521) more than the weight side surfaces (60L, 60R), and the scaffolding upper surface part and the weight upper surface part are disposed in line with each other along the left and right direction, and form a moving passage that allows a worker to move between the one pair of left and right side frames (511, 521). a lower travelling body configured to move on ground; and an upper slewing body supported by the lower travelling body in a slewable manner, wherein the lower travelling body includes: a truck frame including a front surface part and a rear surface part, the truck frame supporting the upper slewing body; one pair of left and right side frames (511, 521) each supporting a crawler that allows circling movement, the one pair of left and right side frames (511, 521) being respectively coupled to both ends of a left and right direction of the truck frame to extend in a front and rear direction more than the truck frame; one pair of front and rear travelling body weights (53, 54) each including a weight upper surface part facing upward and one pair of left and right weight side surfaces (60L, 60R) respectively disposed facing the one pair of left and right side frames (511, 521), the one pair of front and rear travelling body weights (53, 54) being respectively disposed on a front side and a rear side of the truck frame between the one pair of left and right side frames (511, 521); and at least one pair of front and rear scaffolding members each including a scaffolding upper surface part facing upward, characterized by a truck frame including a front surface part and a rear surface part, the truck frame supporting the upper slewing body; one pair of left and right side frames (511, 521) each supporting a crawler that allows circling movement, the one pair of left and right side frames (511, 521) being respectively coupled to both ends of a left and right direction of the truck frame to extend in a front and rear direction more than the truck frame; one pair of front and rear travelling body weights (53, 54) each including a weight upper surface part facing upward and one pair of left and right weight side surfaces (60L, 60R) respectively disposed facing the one pair of left and right side frames (511, 521), the one pair of front and rear travelling body weights (53, 54) being respectively disposed on a front side and a rear side of the truck frame between the one pair of left and right side frames (511, 521); and at least one pair of front and rear scaffolding members each including a scaffolding upper surface part facing upward, characterized by the at least one pair of front and rear scaffolding members being respectively installed in the one pair of front and rear travelling body weights (53, 54) to project to sides of the side frames (511, 521) more than the weight side surfaces (60L, 60R), and the scaffolding upper surface part and the weight upper surface part are disposed in line with each other along the left and right direction, and form a moving passage that allows a worker to move between the one pair of left and right side frames (511, 521).