A swivel work machine comprises: a travel device; a swivel base provided on the travel device; a swivel base provided in the front of the travel device; a dozer provided to the travel device; a swing control; a dozer control; a tilt control member provided to the dozer control, an actuation of the tilt control member causing the dozer to be pivoted about the tilt pivot shaft; a controller having a swing control mode in which an actuation of the swing control causes the implement to be pivoted laterally, and an angle control mode in which an actuation of the swing control causes the dozer to be pivoted about the angle pivot shaft; and a mode change-over portion for switching a control mode of the controller between the swing control mode and the angle control mode.