A toner containing: a non-linear, non-crystalline polyester resin; a crystalline polyester resin; and a charge controlling agent which contains aluminium, wherein an amount of A1 detected in the toner is 0.7 atom% to 1.3 atom%, where the amount of A1 detected is determined based on quantitative analysis of A1 by X-ray photoelectron spectroscopic analysis, wherein [Tg2nd (THF insoluble matter)] is -40°C to 30°C, where the [Tg2nd (THF insoluble matter)] is a glass transition temperature measured in second heating of differential scanning calorimetry of THF insoluble matter of the toner in the following manner: - heat (first heating) about 5.0 g of sample from -80°C to 150°C at the heating rate of 10 °C/min in a nitrogen atmosphere; - cool the sample from 150°C to -80°C at a cooling rate of 10 °C/min; - heat the sample again (second heating) to 150°C at a heating rate of 10 °C/min; and - measure DSC curves for the first heating and the second heating by a differential scanning calorimeter; wherein the THF insoluble matter of the toner is obtained according to the following procedure: - add the toner (1 part) to 40 parts of tetrahydrofuran; - reflux the resultant mixture for 6 hours; - allow insoluble matter in the resultant mixture to precipitate by a centrifugal separator and separate into an insoluble component and a supernatant; and - dry the insoluble component at 40°C for 20 hours, to obtain the THF insoluble matter; and wherein the quantitative analysis of A1 by X-ray photoelectron spectroscopic analysis is measured under the following measurement conditions: - Measuring light source: Al - Analytical area: 900×600 μm 2 - Pass energy: (wide scan) 160 eV, (narrow scan) 40 eV - Energy step size: (wide scan) 1.0 eV, (narrow scan) 0.2 eV. a non-linear, non-crystalline polyester resin; a crystalline polyester resin; and a charge controlling agent which contains aluminium, wherein an amount of A1 detected in the toner is 0.7 atom% to 1.3 atom%, where the amount of A1 detected is determined based on quantitative analysis of A1 by X-ray photoelectron spectroscopic analysis, wherein [Tg2nd (THF insoluble matter)] is -40°C to 30°C, where the [Tg2nd (THF insoluble matter)] is a glass transition temperature measured in second heating of differential scanning calorimetry of THF insoluble matter of the toner in the following manner: - heat (first heating) about 5.0 g of sample from -80°C to 150°C at the heating rate of 10 °C/min in a nitrogen atmosphere; - cool the sample from 150°C to -80°C at a cooling rate of 10 °C/min; - heat the sample again (second heating) to 150°C at a heating rate of 10 °C/min; and - measure DSC curves for the first heating and the second heating by a differential scanning calorimeter; - heat (first heating) about 5.0 g of sample from -80°C to 150°C at the heating rate of 10 °C/min in a nitrogen atmosphere; - cool the sample from 150°C to -80°C at a cooling rate of 10 °C/min; - heat the sample again (second heating) to 150°C at a heating rate of 10 °C/min; and - measure DSC curves for the first heating and the second heating by a differential scanning calorimeter; wherein the THF insoluble matter of the toner is obtained according to the following procedure: - add the toner (1 part) to 40 parts of tetrahydrofuran; - reflux the resultant mixture for 6 hours; - allow insoluble matter in the resultant mixture to precipitate by a centrifugal separator and separate into an insoluble component and a supernatant; and - dry the insoluble component at 40°C for 20 hours, to obtain the THF insoluble matter; - add the toner (1 part) to 40 parts of tetrahydrofuran; - reflux the resultant mixture for 6 hours; - allow insoluble matter in the resultant mixture to precipitate by a centrifugal separator and separate into an insoluble component and a supernatant; and - dry the insoluble component at 40°C for 20 hours, to obtain the THF insoluble matter; and wherein the quantitative analysis of A1 by X-ray photoelectron spectroscopic analysis is measured under the following measurement conditions: - Measuring light source: Al - Analytical area: 900×600 μm 2 - Pass energy: (wide scan) 160 eV, (narrow scan) 40 eV - Energy step size: (wide scan) 1.0 eV, (narrow scan) 0.2 eV. - Measuring light source: Al - Analytical area: 900×600 μm 2 - Pass energy: (wide scan) 160 eV, (narrow scan) 40 eV - Energy step size: (wide scan) 1.0 eV, (narrow scan) 0.2 eV.