Film forming method

A film forming method for forming a coating film on a workpiece having at least two film-deposited portions which are not continuous with each other, the film forming method comprising:

• moving a nozzle of a cold spray device relative to the workpiece along a continuous movement trajectory including trajectories of the film-deposited portions and a connecting trajectory linking the trajectories of the film-deposited portions while continuously spraying a raw material powder from the nozzle,
• continuously spraying the raw material powder from the nozzle by cold spraying to form a coating film on each of the film-deposited portions by the moving of the nozzle along the trajectories for the film-deposited portions, and the spraying of the raw material powder by cold spraying to form the coating film on a surface of the workpiece extending between one of the film-deposited portions and another the film-deposited portions by the movement of the nozzle along the connecting trajectory;
• and
• setting a turnback point on the connecting trajectory where a relative speed between the workpiece and the nozzle decreases in the movement trajectory.