There is provided a rotating structure of a rotary member disposed in a press molding apparatus including the rotary member; a main body; and a rotating block. The rotating block includes a convex strip to be attached to the lower portion of the rotary member and a concave strip to be attached to the main body. The convex strip includes a flat mounting portion and a convex sliding portion, and is formed with bolt holes penetrating through the mounting portion and the convex sliding portion at a plurality of positions. The concave strip includes a flat mounting portion and a concave sliding portion, and is formed with bolt holes penetrating through the mounting portion and the concave sliding portion at a plurality of positions. The convex sliding portion and the concave sliding portion are positioned at slidable positions.