A toner comprising: a toner particle that contains a binder resin and fine particles A at the surface of the toner particle, wherein: the fine particles A are organosilicon polymer fine particles; the organosilicon polymer fine particles have a number-average primary particle diameter, as determined in accordance with the description, of 30 nm to 500 nm; the organosilicon polymer fine particles have an attachment index for a polycarbonate film, as given by the following formula and determined in accordance with the description, of not more than 3.5; and Attachment index = Area ratio A for the organosilicon polymer fine particles transferred to the polycarbonate film, as determined in accordance with the description / Coverage ratio B of the surface of the toner particle by the organosilicon polymer fine particles, as determined in accordance with the description × 100 and 0.05 ≤ b / b + c ≤ 0.40 when an expansion image of the toner is obtained by the following steps (i) to (iii): (i) obtaining a cross sectional image of the toner with a transmission electron microscope; (ii) in the cross sectional image, determining a line along a perimeter of the surface of the toner particle; and (iii) obtaining an expansion image of the cross sectional image by expanding the line determined in the step (ii) into a straight line, in the expansion image, the organosilicon polymer fine particles penetrate into the toner particle in a penetration depth b (nm), and protrude from the toner particle in a protrusion height c (nm), wherein the penetration depth b (nm) and the protrusion height c (nm) are determined in accordance with the description. a toner particle that contains a binder resin and fine particles A at the surface of the toner particle, wherein: the fine particles A are organosilicon polymer fine particles; the organosilicon polymer fine particles have a number-average primary particle diameter, as determined in accordance with the description, of 30 nm to 500 nm; the organosilicon polymer fine particles have an attachment index for a polycarbonate film, as given by the following formula and determined in accordance with the description, of not more than 3.5; and Attachment index = Area ratio A for the organosilicon polymer fine particles transferred to the polycarbonate film, as determined in accordance with the description / Coverage ratio B of the surface of the toner particle by the organosilicon polymer fine particles, as determined in accordance with the description × 100 and 0.05 ≤ b / b + c ≤ 0.40 when an expansion image of the toner is obtained by the following steps (i) to (iii): (i) obtaining a cross sectional image of the toner with a transmission electron microscope; (ii) in the cross sectional image, determining a line along a perimeter of the surface of the toner particle; and (iii) obtaining an expansion image of the cross sectional image by expanding the line determined in the step (ii) into a straight line, in the expansion image, the organosilicon polymer fine particles penetrate into the toner particle in a penetration depth b (nm), and protrude from the toner particle in a protrusion height c (nm), wherein the penetration depth b (nm) and the protrusion height c (nm) are determined in accordance with the description. the fine particles A are organosilicon polymer fine particles; the organosilicon polymer fine particles have a number-average primary particle diameter, as determined in accordance with the description, of 30 nm to 500 nm; the organosilicon polymer fine particles have an attachment index for a polycarbonate film, as given by the following formula and determined in accordance with the description, of not more than 3.5; and Attachment index = Area ratio A for the organosilicon polymer fine particles transferred to the polycarbonate film, as determined in accordance with the description / Coverage ratio B of the surface of the toner particle by the organosilicon polymer fine particles, as determined in accordance with the description × 100 and 0.05 ≤ b / b + c ≤ 0.40 when an expansion image of the toner is obtained by the following steps (i) to (iii): (i) obtaining a cross sectional image of the toner with a transmission electron microscope; (ii) in the cross sectional image, determining a line along a perimeter of the surface of the toner particle; and (iii) obtaining an expansion image of the cross sectional image by expanding the line determined in the step (ii) into a straight line, (i) obtaining a cross sectional image of the toner with a transmission electron microscope; (ii) in the cross sectional image, determining a line along a perimeter of the surface of the toner particle; and (iii) obtaining an expansion image of the cross sectional image by expanding the line determined in the step (ii) into a straight line, in the expansion image, the organosilicon polymer fine particles penetrate into the toner particle in a penetration depth b (nm), and protrude from the toner particle in a protrusion height c (nm), wherein the penetration depth b (nm) and the protrusion height c (nm) are determined in accordance with the description.