[Problem] To provide a construction machine with a step arranged in an operator's cab, which makes it possible to enlarge the shape or dimensions of the step without increasing a swing radius.[Solution] In a compact excavator provided with a step that facilitates ingress to and egress from the operator's cab (6), the step is provided at a part thereof with an outwardly-extending edge portion (12a) that extends out beyond an opening plane (16) forming an ingress/egress opening (20), and a door (5) is provided at a part thereof with a convex part (5a) that covers the outwardly-extending edge portion (12a) of the step when the door (5) is in a closed position. A floor (11) of the operator's cab (6) includes a flat part (11a) arranged on a front side of a seat (4) and a stepped part (11b) arranged in conjunction with the flat part (11a) and on a side of the ingress/egress opening, a flange part (12) which lies in a same plane as the stepped part (11b) of the floor (11) is arranged in conjunction with the stepped part (11b) and in the operator's cab (6), the step includes the stepped part (11b) of the floor (11) and the flange part (12), and the flange part (12) is provided with the outwardly-extending edge portion (12a).