To delivery hoses for each injector and automate a winding work without using a large-scale device, and to facilitate their operations in a high-pressure washing car with a plurality of the injectors.

The high-pressure washing car 1 has a hydraulic system 8. The hydraulic system 8 has an oil reservoir 53, a hydraulic pump 41, a direction changeover valve 56, a flow changeover device 59 and hydraulic motors 51 and 52. The oil reservoir 53 and the direction changeover valve 56 are connected by a supply pipe 54 and a recovery pipe 55, and the changeover valve 56 and the flow changeover device 59 are connected by a first flow pipe 57 and a second flow pipe 58. One end and the other end of hydraulic piping 81 and 82 are connected to the flow changeover device 59. The hydraulic motor 51 rotating and driving a hose reel 15 is fitted to the intermediate section of the hydraulic piping 81. The hydraulic motor 52 rotating and driving a sub-hose reel 16 is fitted to the intermediate section of the hydraulic piping 82.