A cab for a construction machine is provided which is cost effective, good in strength as a cab, usable in narrow sites where an obstacle exists, and good in front visibility and design.The cab for a construction machine has left front, left rear, right front and right rear pillars 12, 13, 14, 15 which vertically extend. The left rear and right rear pillars 13, 15 are made of a pipe material, and the rear part of the cab has greater rigidity than the front part of the cab. The left front and right front pillars 12, 14 are respectively constituted by at least two press-molded parts which are respectively formed into a specified shape by press molding.