A tire comprising: a tread portion having an outboard tread edge (To) to be positioned away from the center of a vehicle body and an inboard tread edge (ti) to be positioned close to the center of the vehicle body, the tread portion provided with main grooves extending continuously in the tire circumferential direction so as to be axially divided into land regions, the main grooves including an inboard shoulder main groove, an outboard shoulder main groove and a crown main groove therebetween, the land regions including an inboard shoulder land region defined between the inboard shoulder main groove and the inboard tread edge (Ti), and provided with inboard shoulder sipes, an inboard middle land region defined between the inboard shoulder main groove and the crown main groove, and provided with inboard middle sipes, an outboard middle land region defined between the crown main groove and the outboard shoulder main groove, and an outboard shoulder land region defined between the outboard shoulder main groove and the outboard tread edge (To), and provided with outboard shoulder sipes, wherein the inboard shoulder sipes and the inboard middle sipes are inclined in the same direction with respect to the tire axial direction, each of the outboard shoulder sipes comprises a deep bottom part having axially inner and outer ends (27, 27e) within the outboard shoulder land region, and a shallow bottom part whose depth is less than the deep bottom part and extending from the axially inner end of the deep bottom part toward the tire equator, the shallow bottom part is composed of an axially outer part extending from the axially inner end of the deep bottom part toward the tire equator, an axially inner part extending from the outboard shoulder main groove toward the outboard tread edge (To), and a middle part connecting between the axially outer part and the axially inner part, characterized in that the axially outer part, the axially inner part and the middle part have angles with respect to the tire axial direction being different from one another. a tread portion having an outboard tread edge (To) to be positioned away from the center of a vehicle body and an inboard tread edge (ti) to be positioned close to the center of the vehicle body, the tread portion provided with main grooves extending continuously in the tire circumferential direction so as to be axially divided into land regions, the main grooves including an inboard shoulder main groove, an outboard shoulder main groove and a crown main groove therebetween, the land regions including an inboard shoulder land region defined between the inboard shoulder main groove and the inboard tread edge (Ti), and provided with inboard shoulder sipes, an inboard middle land region defined between the inboard shoulder main groove and the crown main groove, and provided with inboard middle sipes, an outboard middle land region defined between the crown main groove and the outboard shoulder main groove, and an outboard shoulder land region defined between the outboard shoulder main groove and the outboard tread edge (To), and provided with outboard shoulder sipes, wherein the inboard shoulder sipes and the inboard middle sipes are inclined in the same direction with respect to the tire axial direction, each of the outboard shoulder sipes comprises a deep bottom part having axially inner and outer ends (27, 27e) within the outboard shoulder land region, and a shallow bottom part whose depth is less than the deep bottom part and extending from the axially inner end of the deep bottom part toward the tire equator, the shallow bottom part is composed of an axially outer part extending from the axially inner end of the deep bottom part toward the tire equator, an axially inner part extending from the outboard shoulder main groove toward the outboard tread edge (To), and a middle part connecting between the axially outer part and the axially inner part, characterized in that the axially outer part, the axially inner part and the middle part have angles with respect to the tire axial direction being different from one another.