Toner and method for producing toner

A toner, comprising:

• a toner particle having a core-shell structure comprising a core and a shell covering the core, a thickness of the shell being 100 to 200 nm in a cross section of the toner observed with a transmission electron microscope;
• the core comprising a styrene-acrylic resin and a crystalline material;
• the crystalline material being an ester wax in an amount of 5.00 to 50.00 parts by mass with respect to 100 parts by mass of the styrene-acrylic resin;
• and
• the shell comprising an amorphous polyester resin within 100 nm from a surface of the toner particle, a content ratio of a monomer unit represented by formula (B) in the amorphous polyester resin being 30.0 to 50.0% by mass with respect to the mass of the amorphous polyester resin, a content ratio of a monomer unit represented by formula (C) in the amorphous polyester resin being 25.0 to 50.0% by mass with respect to the mass of the amorphous polyester resin, and a content ratio of a monomer unit represented by formula (D) in the amorphous polyester resin being 1.0 to 50.0% by mass with respect to the mass of the amorphous polyester resin
• where R1 represents a benzene ring, R2 represents an ethylene or a propylene group, x and y are each an integer of 1 or more and an average value of x+y is 2 to 10, and R3 represents an ethylene or a propylene group, wherein
• the toner has a softening point determined by a constant-load extrusion type capillary rheometer of 150° C. or less,
• where a value obtained by dividing an amount of counted ions for a structure represented by formula (A) measured from the surface of the toner particle to a depth of 100 nm by time-of-flight secondary ion mass spectrometry by a total amount of counted ions is taken as a standard value
• one or more peaks of the standard value are present within a range of 100 nm from the surface of the toner particle, and
• 1.15≤A(dmax)/A(0)≤5.00 and 0.010≤A(0)
• where A(dmax) is a standard value of a peak having a maximum standard value among the one or more present peaks and A(0) is a standard value on the toner particle surface.