A crumb of a block copolymer or a hydrogenated product thereof, comprising a polymer block A mainly containing a vinyl aromatic monomer unit, a polymer block B mainly containing a conjugated diene monomer unit, and/or a polymer block C consisting of a vinyl aromatic monomer unit and a conjugated diene monomer unit, wherein the following to are satisfied: an average weight value per crumb is 0.0080 to 0.0500 g, an average aspect ratio value per crumb, calculated as described in "<Method for calculating aspect ratio of crumb>" the description, is 1.00 to 3.50, an average volume value per crumb, calculated as described in "<Method for calculating volume of crumb>" the description, is 18.0 to 110 mm 3, an average specific gravity value per crumb, calculated as described in "<Method for calculating specific gravity of crumb>" the description, is 2.0 × 10 -4 to 1.0 × 10 -3 g/mm 3, a component passing through a sieve with an aperture of 3.35 mm corresponds to 41% by mass or more of the entire crumb, the value being determined as described in "<Evaluation of grain size of crumb>" in the description, and a melt flow rate of the crumb, measured as described in "<Melt flow rate >" in the desription, is 0.3 g/10 min or less. a polymer block A mainly containing a vinyl aromatic monomer unit, a polymer block B mainly containing a conjugated diene monomer unit, and/or a polymer block C consisting of a vinyl aromatic monomer unit and a conjugated diene monomer unit, wherein the following to are satisfied: an average weight value per crumb is 0.0080 to 0.0500 g, an average aspect ratio value per crumb, calculated as described in "<Method for calculating aspect ratio of crumb>" the description, is 1.00 to 3.50, an average volume value per crumb, calculated as described in "<Method for calculating volume of crumb>" the description, is 18.0 to 110 mm 3, an average specific gravity value per crumb, calculated as described in "<Method for calculating specific gravity of crumb>" the description, is 2.0 × 10 -4 to 1.0 × 10 -3 g/mm 3, a component passing through a sieve with an aperture of 3.35 mm corresponds to 41% by mass or more of the entire crumb, the value being determined as described in "<Evaluation of grain size of crumb>" in the description, and a melt flow rate of the crumb, measured as described in "<Melt flow rate >" in the desription, is 0.3 g/10 min or less. an average weight value per crumb is 0.0080 to 0.0500 g, an average aspect ratio value per crumb, calculated as described in "<Method for calculating aspect ratio of crumb>" the description, is 1.00 to 3.50, an average volume value per crumb, calculated as described in "<Method for calculating volume of crumb>" the description, is 18.0 to 110 mm 3, an average specific gravity value per crumb, calculated as described in "<Method for calculating specific gravity of crumb>" the description, is 2.0 × 10 -4 to 1.0 × 10 -3 g/mm 3, a component passing through a sieve with an aperture of 3.35 mm corresponds to 41% by mass or more of the entire crumb, the value being determined as described in "<Evaluation of grain size of crumb>" in the description, and a melt flow rate of the crumb, measured as described in "<Melt flow rate >" in the desription, is 0.3 g/10 min or less.