A tire comprising: a tread portion; at least one circumferential direction groove (12, 13) formed on the tread portion, the circumferential direction groove (12, 13) including a plurality of bent portions (17, 18) to be extended in a zigzag manner in a tire circumferential direction; and at least one first lateral groove communicated with the circumferential direction groove (12, 13) and extended in a tire width direction, wherein: the bent portions (17, 18) are bent at an angle between 12 degrees and 41 degrees against the tire circumferential direction; a groove width of the circumferential direction groove (12, 13) is set in a range between 13 mm and 19 mm; the first lateral groove includes an arc-shaped curve portion; a groove depth of the first lateral groove is smaller than a groove depth of the circumferential direction groove (12, 13); a groove width of the first lateral groove is smaller than the groove width of the circumferential direction groove (12, 13); and the first lateral groove includes a groove having one groove wall and another groove wall facing each other not to be contacted with each other when the tread portion is contacted with the ground, both groove walls of the bent portions (17, 18) facing each other are asymmetric with respect to a tire radial direction, characterized in that: an inclined angle of a groove wall at an inner side of a bend of the bent portions (17, 18) among the both groove walls of the bent portions (17, 18) facing each other is smaller than an inclined angle of a groove wall at an outer side of the bend of the bent portions (17, 18), the bent portions (17, 18) mean all bent portions formed in the tire circumferential direction, and the inclined angle denotes an angle that indicates how much the groove wall is inclined against a wheel tread. a tread portion; at least one circumferential direction groove (12, 13) formed on the tread portion, the circumferential direction groove (12, 13) including a plurality of bent portions (17, 18) to be extended in a zigzag manner in a tire circumferential direction; and at least one first lateral groove communicated with the circumferential direction groove (12, 13) and extended in a tire width direction, wherein: the bent portions (17, 18) are bent at an angle between 12 degrees and 41 degrees against the tire circumferential direction; a groove width of the circumferential direction groove (12, 13) is set in a range between 13 mm and 19 mm; the first lateral groove includes an arc-shaped curve portion; a groove depth of the first lateral groove is smaller than a groove depth of the circumferential direction groove (12, 13); a groove width of the first lateral groove is smaller than the groove width of the circumferential direction groove (12, 13); and the first lateral groove includes a groove having one groove wall and another groove wall facing each other not to be contacted with each other when the tread portion is contacted with the ground, the bent portions (17, 18) are bent at an angle between 12 degrees and 41 degrees against the tire circumferential direction; a groove width of the circumferential direction groove (12, 13) is set in a range between 13 mm and 19 mm; the first lateral groove includes an arc-shaped curve portion; a groove depth of the first lateral groove is smaller than a groove depth of the circumferential direction groove (12, 13); a groove width of the first lateral groove is smaller than the groove width of the circumferential direction groove (12, 13); and the first lateral groove includes a groove having one groove wall and another groove wall facing each other not to be contacted with each other when the tread portion is contacted with the ground, both groove walls of the bent portions (17, 18) facing each other are asymmetric with respect to a tire radial direction, characterized in that: an inclined angle of a groove wall at an inner side of a bend of the bent portions (17, 18) among the both groove walls of the bent portions (17, 18) facing each other is smaller than an inclined angle of a groove wall at an outer side of the bend of the bent portions (17, 18), the bent portions (17, 18) mean all bent portions formed in the tire circumferential direction, and the inclined angle denotes an angle that indicates how much the groove wall is inclined against a wheel tread. an inclined angle of a groove wall at an inner side of a bend of the bent portions (17, 18) among the both groove walls of the bent portions (17, 18) facing each other is smaller than an inclined angle of a groove wall at an outer side of the bend of the bent portions (17, 18), the bent portions (17, 18) mean all bent portions formed in the tire circumferential direction, and the inclined angle denotes an angle that indicates how much the groove wall is inclined against a wheel tread.