PROBLEM TO BE SOLVED : To stably support a nozzle support frame in a machine body in a freely rolling manner in a riding type chemical spreader. SOLUTION : A riding type chemical spreader includes a nozzle support frame 8 for supporting a spraying nozzle for spraying chemicals on a field, and a rolling mechanism 36 for supporting the nozzle support frame 8 in supporting units 30, 31, 32 of a machine body in a freely rolling manner. The riding type chemical spreader includes a front/rear displacement prevention part 37 for preventing the longitudinal displacement of the nozzle support frame 8, while integrally rolling with the nozzle support frame 8. The front/rear displacement prevention part 37 is connected to the nozzle support frame 8 through a connecting member 35 and supported in a position separated from the nozzle support frame 8. SELECTED DRAWING : Figure 8 COPYRIGHT : (C)2019, JPO&INPIT