A pneumatic tire, having a plurality of sipes formed in land portions of a tread thereof so as to each open at a surface of a land portion and extend in the tire width direction, wherein: in a cross section of the land portion in a direction orthogonal to the sipe extending direction, provided that an imaginary line linking an open end (P 0) at the surface of the land portion and the innermost end (P i) in the tire radial direction of each sipe is regarded as a sipe main line (1a-1d), at least two of the sipes in the land portion are "inclined sipes" in which the sipe main lines (1a-1d) thereof are each inclined with respect to the tire radial direction; each inclined sipe (11a,-11d) has inner bent portions each protruding with respect to the sipe main line (1a-1d) and peaks (P 1 -P 4) of the inner bent portions are positioned deeper than 20% of the sipe depth (d) measured from the surface of the land portion in the cross section; and the sipe main line(s) (1a-1d) of at least one of the inclined sipes (11a-11d) are inclined in a direction opposite, with respect to the tire radial direction, to the sipe main line (1a-1d) of any one of the other inclined sipes (11a-11d) in the cross section, characterized in that: at least one of the inclined sipes (11a-11d) has four or more inner bent portions; the inner bent portions of the at least one of the inclined sipes (11a-11d) include a first portion (S P1) and a second portion (S P2) adjacent to the first portion (S P1) on the inner side in the tire radial direction; and an amplitude of the first portion (S P1) with respect to the sipe main line (1a-1d) is larger than an amplitude of the second portion (S P2) with respect to the sipe main line (la-ld). in a cross section of the land portion in a direction orthogonal to the sipe extending direction, provided that an imaginary line linking an open end (P 0) at the surface of the land portion and the innermost end (P i) in the tire radial direction of each sipe is regarded as a sipe main line (1a-1d), at least two of the sipes in the land portion are "inclined sipes" in which the sipe main lines (1a-1d) thereof are each inclined with respect to the tire radial direction; each inclined sipe (11a,-11d) has inner bent portions each protruding with respect to the sipe main line (1a-1d) and peaks (P 1 -P 4) of the inner bent portions are positioned deeper than 20% of the sipe depth (d) measured from the surface of the land portion in the cross section; and the sipe main line(s) (1a-1d) of at least one of the inclined sipes (11a-11d) are inclined in a direction opposite, with respect to the tire radial direction, to the sipe main line (1a-1d) of any one of the other inclined sipes (11a-11d) in the cross section, characterized in that: at least one of the inclined sipes (11a-11d) has four or more inner bent portions; the inner bent portions of the at least one of the inclined sipes (11a-11d) include a first portion (S P1) and a second portion (S P2) adjacent to the first portion (S P1) on the inner side in the tire radial direction; and an amplitude of the first portion (S P1) with respect to the sipe main line (1a-1d) is larger than an amplitude of the second portion (S P2) with respect to the sipe main line (la-ld). at least one of the inclined sipes (11a-11d) has four or more inner bent portions; the inner bent portions of the at least one of the inclined sipes (11a-11d) include a first portion (S P1) and a second portion (S P2) adjacent to the first portion (S P1) on the inner side in the tire radial direction; and an amplitude of the first portion (S P1) with respect to the sipe main line (1a-1d) is larger than an amplitude of the second portion (S P2) with respect to the sipe main line (la-ld).