A toner comprising: A toner particle containing a binder resin and a colorant; and a strontium titanate particle on a surface of the toner particle, wherein when the toner is washed by water in order to remove a strontium titanate particle desorbable to obtain a water-washed toner by water washing, measured as indicated in the description, (a) the water-washed toner contains the strontium titanate particle, (b) the strontium titanate particle contained in the water-washed toner has a number average particle diameter of primary particle, measured as indicated in the description, of 10 nm or more and 150 nm or less, (c) when a distribution of an Sr element derived from strontium titanate in the water-washed toner in a depth direction is determined, (i) when an Sr element abundance on an outermost surface, measured as indicated in the description, is represented by x (atomic%), x satisfies 0.00 < x ≤ 0.80, (ii) the distribution has at least one peak of the Sr element abundance in a region from the outermost surface to 50 nm, and (iii) when a difference between x and xp is represented by xp - x, xp - x satisfies 0.00 < xp - x ≤ 0.95, where xp (atomic %), measured as indicated in the description, is an Sr element abundance at a maximum peak in the region from the outermost surface to 50 nm in the distribution. A toner particle containing a binder resin and a colorant; and a strontium titanate particle on a surface of the toner particle, wherein when the toner is washed by water in order to remove a strontium titanate particle desorbable to obtain a water-washed toner by water washing, measured as indicated in the description, (a) the water-washed toner contains the strontium titanate particle, (b) the strontium titanate particle contained in the water-washed toner has a number average particle diameter of primary particle, measured as indicated in the description, of 10 nm or more and 150 nm or less, (c) when a distribution of an Sr element derived from strontium titanate in the water-washed toner in a depth direction is determined, (i) when an Sr element abundance on an outermost surface, measured as indicated in the description, is represented by x (atomic%), x satisfies 0.00 < x ≤ 0.80, (ii) the distribution has at least one peak of the Sr element abundance in a region from the outermost surface to 50 nm, and (iii) when a difference between x and xp is represented by xp - x, xp - x satisfies 0.00 < xp - x ≤ 0.95, where xp (atomic %), measured as indicated in the description, is an Sr element abundance at a maximum peak in the region from the outermost surface to 50 nm in the distribution. (a) the water-washed toner contains the strontium titanate particle, (b) the strontium titanate particle contained in the water-washed toner has a number average particle diameter of primary particle, measured as indicated in the description, of 10 nm or more and 150 nm or less, (c) when a distribution of an Sr element derived from strontium titanate in the water-washed toner in a depth direction is determined, (i) when an Sr element abundance on an outermost surface, measured as indicated in the description, is represented by x (atomic%), x satisfies 0.00 < x ≤ 0.80, (ii) the distribution has at least one peak of the Sr element abundance in a region from the outermost surface to 50 nm, and (iii) when a difference between x and xp is represented by xp - x, xp - x satisfies 0.00 < xp - x ≤ 0.95, where xp (atomic %), measured as indicated in the description, is an Sr element abundance at a maximum peak in the region from the outermost surface to 50 nm in the distribution. (i) when an Sr element abundance on an outermost surface, measured as indicated in the description, is represented by x (atomic%), x satisfies 0.00 < x ≤ 0.80, (ii) the distribution has at least one peak of the Sr element abundance in a region from the outermost surface to 50 nm, and (iii) when a difference between x and xp is represented by xp - x, xp - x satisfies 0.00 < xp - x ≤ 0.95, where xp (atomic %), measured as indicated in the description, is an Sr element abundance at a maximum peak in the region from the outermost surface to 50 nm in the distribution.