Filter for cigarette product and cigarette product

A filter for cigarette product comprising:

• a mouthpiece end side-filter material that is arranged on the mouthpiece end side;
• and
• a front stage-filter material that is arranged at the front stage of the mouthpiece end side-filter material and filters mainstream smoke, wherein:
• the mouthpiece end side-filter material has a low air flow-resistance unit that is arranged in a part of a cross section from a front end surface to a rear end surface and having a relatively low air flow-resistance, and a high air flow-resistance unit that is arranged in the remainder of the cross section from the front end surface to the rear end surface and having a higher air flow-resistance than the low air flow-resistance unit;
• and
• at least on the rear end surface of the mouthpiece end side-filter material, the low air flow-resistance unit is arranged only in one semicircular area, of two parts into which the cross section of the mouthpiece end side-filter material is divided by a borderline passing through a central axis of the cross section.