A shock absorber includes a first shock absorbing member formed of a foam, and a second shock absorbing member formed of a foam and having hardness greater than the first shock absorbing member. The first shock absorbing member and the second shock absorbing member are arranged in adjacent to each other and connected to each other such that a part of one of the first shock absorbing member and the second shock absorbing member is surrounded by another one of the first shock absorbing member and the second shock absorbing member, thereby the first shock absorbing member and the second shock absorbing member are connected integrally with each other.