A sample analyzing method comprising: denaturing DNA by heating a measurement specimen; bleaching the measurement specimen to inhibit autofluorescence from the measurement specimen; labeling a test substance by binding a fluorescent dye to the test substance in the measurement specimen; and capturing an image of fluorescence originated from the fluorescent dye by irradiating the measurement specimen with light, wherein the denaturing of the DNA is performed before the bleaching, wherein the bleaching process is performed after treatment processes of applying the respective treatments to the measurement specimen by raising the temperature of the measurement specimen to 62 °C or higher; and performing no treatment process of applying a treatment to the measurement specimen by raising the temperature of the measurement specimen to 62 °C or higher between the bleaching process and the image capture process, wherein the fluorescent dye is switchable between an activated state in which the fluorescent dye emits fluorescence when irradiated with light for fluorescence excitation and an inactivated state in which the fluorescent dye emits no fluorescence even when irradiated with the light for fluorescence excitation, and the capturing of the image includes quenching the fluorescence of the fluorescent dye, activating part of the fluorescent dye whose fluorescence is quenched, and capturing an image of the fluorescence by irradiating the measurement specimen with the light for excitation. denaturing DNA by heating a measurement specimen; bleaching the measurement specimen to inhibit autofluorescence from the measurement specimen; labeling a test substance by binding a fluorescent dye to the test substance in the measurement specimen; and capturing an image of fluorescence originated from the fluorescent dye by irradiating the measurement specimen with light, wherein the denaturing of the DNA is performed before the bleaching, wherein the bleaching process is performed after treatment processes of applying the respective treatments to the measurement specimen by raising the temperature of the measurement specimen to 62 °C or higher; and performing no treatment process of applying a treatment to the measurement specimen by raising the temperature of the measurement specimen to 62 °C or higher between the bleaching process and the image capture process, wherein the fluorescent dye is switchable between an activated state in which the fluorescent dye emits fluorescence when irradiated with light for fluorescence excitation and an inactivated state in which the fluorescent dye emits no fluorescence even when irradiated with the light for fluorescence excitation, and the capturing of the image includes quenching the fluorescence of the fluorescent dye, activating part of the fluorescent dye whose fluorescence is quenched, and capturing an image of the fluorescence by irradiating the measurement specimen with the light for excitation. the fluorescent dye is switchable between an activated state in which the fluorescent dye emits fluorescence when irradiated with light for fluorescence excitation and an inactivated state in which the fluorescent dye emits no fluorescence even when irradiated with the light for fluorescence excitation, and the capturing of the image includes quenching the fluorescence of the fluorescent dye, activating part of the fluorescent dye whose fluorescence is quenched, and capturing an image of the fluorescence by irradiating the measurement specimen with the light for excitation. quenching the fluorescence of the fluorescent dye, activating part of the fluorescent dye whose fluorescence is quenched, and capturing an image of the fluorescence by irradiating the measurement specimen with the light for excitation.