To provide a pressure switching valve device of a structure to suppress generation of cavitation erosion, and an injector equipped with the device capable of maintaining an accurate fuel injection control.

The pressure switching device 10 includes a control pressure chamber 101 into which high-pressure fluid 200 is introduced, a low-pressure fluid passage 105 maintained at a low pressure, a choked fluid passage 104 communicating the control pressure chamber 101 and the low-pressure fluid passage 105, and a valve element 160 for opening and closing the choked fluid passage 104. The device 10 opens and closes the valve element 160 to control flowing out of the high-pressure fluid 200 from the control pressure chamber 101 to the low-pressure fluid passage 105 and thereby increasing and decreasing a pressure of the control pressure chamber 101. The choked passage 104 includes a plurality of choked passages opened at one end in a surface 102 closed by the valve element 160 when the valve element 160 is closed.