A baseball or softball bat and a method for manufacturing the bat are provided. The bat includes a batting portion formed of wood into a cylindrical shape, and a bat main body made of a fiber-reinforced plastic. A part of the bat main body is inserted in the batting portion from an open end of the batting portion, and the rest of the bat main body is exposed from the batting portion. The bat further includes a suppressing member arranged on an outer circumference of the bat main body. The suppressing member prevents change of orientation of fibers in the fiber-reinforced plastic. The suppressing member is positioned so as to contact a step formed between the outer circumference of the bat main body and an outer circumference of the batting portion at the open end of the batting portion.