To easily get on and off a cab in a working posture many in a use frequency, while installing a door of the cab only on one-side side face, in a boom type work vehicle for executing vehicle travel operation and boom work operation from a single cab.

In a boom type work vehicle, a cab 4 for executing both operations of vehicle travel operation and boom work operation, is installed in a side part position on a swivel base 2 installed on a vehicle body 11. The cab 4 makes the swivel base 2 turn so that the cab can horizontally rotate in a range of an angle 180° between a travel posture of turning to the vehicle front and a working posture of turning to the vehicle rear. In the cab 4, a door 44 is provided only on a cab side face 42 on the vehicle center line P side in the travel posture, and thereby, the sheet number of doors 44 of the cab 4 is set only to one sheet, and the door 44 of the cab in the working posture many in the use frequency, can be turned to the lateral outside of a vehicle (to easily get on and off the cab in the working posture many in the use frequency).