Provided is a tire noise reduction device which is installed on the inner surface of a tread part facing the hollow part of a pneumatic tire. The tire noise reduction device comprises an annular elastic fixing band and sound absorbing members made of a porous material installed on the inner surface of the tread part at two circumferentially opposite positions by the elastic fixing band. The elastic fixing band has an outer peripheral length (L) in a certain range specified by its relation with the mass (Wa) of the sound absorbing material, the overall mass (We) of the tire noise reducing device, and the inner peripheral length (Li) of the tire.