Method for manufacturing a gear

A method for manufacturing a gear by performing rolling processing on a tooth part of a sintered gear raw material, the method comprising:

• pressing the gear raw material toward a center of rotation of the gear raw material by a rolling machine when the rolling processing is performed on the tooth part of the gear raw material;
• pressing a region where an internal density of the tooth part of the gear raw material decreases at a preset depth when at least the rolling processing is performed on the tooth part of the gear raw material toward a center of a thickness thereof by a pressing machine;
• and
• applying the pressing force of the pressing machine to a center position of a tooth height of the tooth part of the gear raw material so that a density at the center position of the tooth height of the tooth part of the gear raw material is higher than a preset target density.