To achieve higher productivity by facilitating the taking out of a core and half shells out of a mold dice while maintaining the performance.

The subject tennis ball 1 has the core 2, two felt parts 3 and seam parts 4. The core 2 is hollow and a rubber composition making up the core 2 has 100pts.mass of a rubber base material and contains 1pt.mass to 40pts.mass of rice hull and 1pt.mass to 5pts.mass of a softening agent. In the tennis ball 1, a plug formed by kneading the rubber composition is placed into the first mold die to obtain a cup-shaped half shell, and two half shells thus obtained are stuck together and undergoes a molding vulcanization by using the second mold die to obtain the core 2. Thereafter, the felt parts 3 are stuck on the core 2. In the production process, a higher die releasing performance of the core 2 and the half shells 5 is achieved without using any die releasing agent for the dice.