A toner, comprising: a binder resin, wherein the binder resin consists of a block copolymer resin, wherein the block copolymer resin comprises a segment derived from a crystalline polyester resin covalently bonded to a segment derived from a non-crystalline polyester resin and optionally a crystalline resin having the segment of the block copolymer, wherein a crystalline segment which is the crystalline polyester resin and a non-crystalline segment which is the non-crystalline polyester resin of the block copolymer resin have sea-island structure, wherein the non-crystalline segment is the sea and the crystalline segment is the island, wherein the crystalline polyester resin comprises a dihydric aliphatic alcohol component and a divalent aliphatic carboxylic acid component as constituent components, wherein the non-crystalline polyester resin comprises a dihydric aliphatic alcohol component and a polyvalent aromatic carboxylic acid component as constituent components, wherein the crystalline polyester resin and the non-crystalline polyester resin in the block copolymer resin have a molar ratio (crystalline resin / non-crystalline resin) of from 10/90 to 40/60, wherein a spin-spin relaxation time of the toner at 50°C measured by a measuring method using pulse method NMR of a 1H nucleus as described in the description is 0.05 msec. or shorter, a spin-spin relaxation time of the toner at 130°C when warmed from 50°C to 130°C is 15 msec. or longer, and a spin-spin relaxation time (t'70) of the toner at 70°C when cooled from 130°C to 70°C is 1.00 msec. or shorter, and wherein a binarized image of the toner determined as disclosed in the description, includes first phase difference images constituted by portions having a large phase difference and a second phase difference image constituted by a portion having a small phase difference, the first phase difference images are dispersed in the second phase difference image, and a dispersion diameter of the first phase difference images is 150 nm or less. a binder resin, wherein the binder resin consists of a block copolymer resin, wherein the block copolymer resin comprises a segment derived from a crystalline polyester resin covalently bonded to a segment derived from a non-crystalline polyester resin and optionally a crystalline resin having the segment of the block copolymer, wherein a crystalline segment which is the crystalline polyester resin and a non-crystalline segment which is the non-crystalline polyester resin of the block copolymer resin have sea-island structure, wherein the non-crystalline segment is the sea and the crystalline segment is the island, wherein the crystalline polyester resin comprises a dihydric aliphatic alcohol component and a divalent aliphatic carboxylic acid component as constituent components, wherein the non-crystalline polyester resin comprises a dihydric aliphatic alcohol component and a polyvalent aromatic carboxylic acid component as constituent components, wherein the crystalline polyester resin and the non-crystalline polyester resin in the block copolymer resin have a molar ratio (crystalline resin / non-crystalline resin) of from 10/90 to 40/60, wherein a spin-spin relaxation time of the toner at 50°C measured by a measuring method using pulse method NMR of a 1H nucleus as described in the description is 0.05 msec. or shorter, a spin-spin relaxation time of the toner at 130°C when warmed from 50°C to 130°C is 15 msec. or longer, and a spin-spin relaxation time (t'70) of the toner at 70°C when cooled from 130°C to 70°C is 1.00 msec. or shorter, and wherein a binarized image of the toner determined as disclosed in the description, includes first phase difference images constituted by portions having a large phase difference and a second phase difference image constituted by a portion having a small phase difference, the first phase difference images are dispersed in the second phase difference image, and a dispersion diameter of the first phase difference images is 150 nm or less.