A pneumatic tire for a motorcycle comprising a tread which is provided with a plurality of blocks (14, 16, 18, 20, 40, 48) in which recessed portions (26, 32, 36, 44, 52) are formed that open to a tread surface side, wherein at least some of the plurality of the blocks (14, 16, 18, 20, 40) in which the recessed portions (26, 32, 36, 44) are formed have protrusions (28, 30, 38, 46) that are formed on bottom portions of the recessed portions (26, 32, 36, 44, 52), characterised in that: the tread further comprises: a center portion block row comprising a plurality of blocks (14, 16, 18, 20) that are disposed along a circumferential direction at a width direction center of the tread; a tread end-side block row comprising a plurality of blocks that are disposed at tire width direction outer sides of the center portion block row and are disposed at tread end sides of the tread and along the circumferential direction; and a middle portion block row comprising a plurality of blocks that are disposed between the center portion block row and the tread end-side block row and along the circumferential direction, wherein: the blocks (14, 16, 18, 20) configuring the center portion block row are provided with one or more of the recessed portions (26, 32, 36) per block; the total number of the recessed portions (44, 52) provided at the blocks configuring the middle portion block rows and the blocks configuring the tread end-side block rows is configured to be fewer than the total number of the recessed portions (26, 32, 36) provided at the blocks (14, 16, 18, 20) configuring the center portion block row; and the blocks (14, 16, 18, 20) configuring the center portion block row and the blocks configuring the middle portion block row are provided with the recessed portions (26, 32, 36, 44) in which the protrusions (28, 30, 38, 46) are formed. wherein at least some of the plurality of the blocks (14, 16, 18, 20, 40) in which the recessed portions (26, 32, 36, 44) are formed have protrusions (28, 30, 38, 46) that are formed on bottom portions of the recessed portions (26, 32, 36, 44, 52), characterised in that: the tread further comprises: a center portion block row comprising a plurality of blocks (14, 16, 18, 20) that are disposed along a circumferential direction at a width direction center of the tread; a tread end-side block row comprising a plurality of blocks that are disposed at tire width direction outer sides of the center portion block row and are disposed at tread end sides of the tread and along the circumferential direction; and a middle portion block row comprising a plurality of blocks that are disposed between the center portion block row and the tread end-side block row and along the circumferential direction, wherein: the blocks (14, 16, 18, 20) configuring the center portion block row are provided with one or more of the recessed portions (26, 32, 36) per block; the total number of the recessed portions (44, 52) provided at the blocks configuring the middle portion block rows and the blocks configuring the tread end-side block rows is configured to be fewer than the total number of the recessed portions (26, 32, 36) provided at the blocks (14, 16, 18, 20) configuring the center portion block row; and the blocks (14, 16, 18, 20) configuring the center portion block row and the blocks configuring the middle portion block row are provided with the recessed portions (26, 32, 36, 44) in which the protrusions (28, 30, 38, 46) are formed. a center portion block row comprising a plurality of blocks (14, 16, 18, 20) that are disposed along a circumferential direction at a width direction center of the tread; a tread end-side block row comprising a plurality of blocks that are disposed at tire width direction outer sides of the center portion block row and are disposed at tread end sides of the tread and along the circumferential direction; and a middle portion block row comprising a plurality of blocks that are disposed between the center portion block row and the tread end-side block row and along the circumferential direction, wherein: the blocks (14, 16, 18, 20) configuring the center portion block row are provided with one or more of the recessed portions (26, 32, 36) per block; the total number of the recessed portions (44, 52) provided at the blocks configuring the middle portion block rows and the blocks configuring the tread end-side block rows is configured to be fewer than the total number of the recessed portions (26, 32, 36) provided at the blocks (14, 16, 18, 20) configuring the center portion block row; and the blocks (14, 16, 18, 20) configuring the center portion block row and the blocks configuring the middle portion block row are provided with the recessed portions (26, 32, 36, 44) in which the protrusions (28, 30, 38, 46) are formed. the blocks (14, 16, 18, 20) configuring the center portion block row are provided with one or more of the recessed portions (26, 32, 36) per block; the total number of the recessed portions (44, 52) provided at the blocks configuring the middle portion block rows and the blocks configuring the tread end-side block rows is configured to be fewer than the total number of the recessed portions (26, 32, 36) provided at the blocks (14, 16, 18, 20) configuring the center portion block row; and the blocks (14, 16, 18, 20) configuring the center portion block row and the blocks configuring the middle portion block row are provided with the recessed portions (26, 32, 36, 44) in which the protrusions (28, 30, 38, 46) are formed.