To provide a recyclable elastic material that has improved moldability without adverse effect on the impact resilience performance and the ball hit feeling and a one-piece golf ball using the recyclable elastic material.

In this elastic material, the dynamically crosslinked butadiene rubber is finely dispersed in an ionomer and a plasticizer having a solubility coefficient of 13-18 MPa0.5 is included in the butadiene rubber in an amount of 1-30 pts.wt. per 100 pts.wt. of the rubber. The content ratio of the ionomer to the butadiene rubber is 80/20-45/55.