A toner, comprising: a crystalline polyester resin; an amorphous resin; and a composite resin having a condensation polymerization resin unit and an addition polymerization resin unit; wherein a molecular weight distribution of the toner based on THF-soluble contents thereof has a main peak within a molecular weight range from 1,000 to 10,000 and a half bandwidth of the main peak is 15,000 or less, the molecular weight distribution being determined by gel permeation chromatography, wherein the toner includes chloroform-insoluble contents, and wherein a ratio C/R of the toner is within a range from 0.03 to 0.55, wherein C represents the height of a spectrum peak specific to the crystalline polyester resin between a first minimum at which the absorbance is smallest and a second minimum at which the absorbance is second smallest, each within a wavenumber range from 1130 to 1220 cm -1, wherein the height C of the peak is determined by drawing a baseline between the first and second minima, drawing a vertical line from the peak towards the horizontal axis, the absolute difference in absorbance between the peak and the intersection of the vertical line with the baseline being the height C of the peak; and R represents the height of a spectrum peak specific to the amorphous resin between a first minimum at which the absorbance is smallest, and a second minimum at which the absorbance is second smallest, each within a wavenumber range from 780 to 900 cm -1, wherein the height of the peak is determined by drawing a baseline between the first and second minima, drawing a vertical line from the peak towards the horizontal axis, the absolute difference in absorbance between the peak and the intersection of the vertical line with the baseline being the height R of the peak, respectively, determined by a Fourier transform infrared spectroscopic attenuation total reflection method using a Fourier transform infrared spectrophotometer after the toner is stored in a thermostatic chamber at 45°C for 12 hours and 0.6 g of the toner is pelletized with a load of 1,000 kg for 30 seconds and formed into a pellet having a diameter of 20 mm. a crystalline polyester resin; an amorphous resin; and a composite resin having a condensation polymerization resin unit and an addition polymerization resin unit; wherein a molecular weight distribution of the toner based on THF-soluble contents thereof has a main peak within a molecular weight range from 1,000 to 10,000 and a half bandwidth of the main peak is 15,000 or less, the molecular weight distribution being determined by gel permeation chromatography, wherein the toner includes chloroform-insoluble contents, and wherein a ratio C/R of the toner is within a range from 0.03 to 0.55, wherein C represents the height of a spectrum peak specific to the crystalline polyester resin between a first minimum at which the absorbance is smallest and a second minimum at which the absorbance is second smallest, each within a wavenumber range from 1130 to 1220 cm -1, wherein the height C of the peak is determined by drawing a baseline between the first and second minima, drawing a vertical line from the peak towards the horizontal axis, the absolute difference in absorbance between the peak and the intersection of the vertical line with the baseline being the height C of the peak; and R represents the height of a spectrum peak specific to the amorphous resin between a first minimum at which the absorbance is smallest, and a second minimum at which the absorbance is second smallest, each within a wavenumber range from 780 to 900 cm -1, wherein the height of the peak is determined by drawing a baseline between the first and second minima, drawing a vertical line from the peak towards the horizontal axis, the absolute difference in absorbance between the peak and the intersection of the vertical line with the baseline being the height R of the peak, respectively, determined by a Fourier transform infrared spectroscopic attenuation total reflection method using a Fourier transform infrared spectrophotometer after the toner is stored in a thermostatic chamber at 45°C for 12 hours and 0.6 g of the toner is pelletized with a load of 1,000 kg for 30 seconds and formed into a pellet having a diameter of 20 mm.