There is provided a baseball including an inner core, and an outer core covering an outer circumferential surface of the inner core, the inner core being formed to have a dimension of 20% or more and 80% or less of an outer diameter of the inner core and the outer core of the baseball, and having a dynamic viscoelasticity loss coefficient (tanδ) of 0.3 or less, the outer core being formed to have a thickness of 10% or more and 40% or less of the outer diameter of the inner core and the outer core of the baseball, and having an elastic modulus of 1.5 MPa or less. As a result, there can be obtained a baseball that achieves a high level of safety when the baseball hits against a human body and achieves a hit distance equal to and longer than that of a ball for hardball.