A headphone comprising: a front air chamber formed on a front side of a driver unit between an ear cup and an ear of a user when the headphone is in use, a first microphone that is configured to receive a sound in the front air chamber including an external sound, the first microphone being provided in the front air chamber; the driver unit that is configured to emit a noise-canceling sound from the front side of the driver unit into the front air chamber, the noise-canceling sound canceling at least a part of the external sound included in the sound in the front air chamber received by the first microphone; a second microphone that is provided on the back side of the driver unit, wherein the second microphone is configured to receive an inverted noise-canceling sound, of which phase is opposite to the phase of the noise-canceling sound, emitted from a back side of the driver unit that is an opposite side of the front side of the driver unit; and a sound generating part that is configured to generate the noise-canceling sound by adding a signal based on the inverted noise-canceling sound received by the second microphone to a signal based on the sound in the front air chamber received by the first microphone, wherein the sound generating part has an attenuator that is configured to attenuate the inverted noise-canceling sound received by the second microphone to generate an attenuated signal, the attenuation amount in the attenuator is the same as the attenuation amount with which the noise-cancelling sound is attenuated in the process of becoming an attenuated noise-canceling sound by traveling from the driver unit to the first microphone, and a distance between the second microphone and a center position of the driver unit is less than a distance between the first microphone and the center position of the driver unit. a front air chamber formed on a front side of a driver unit between an ear cup and an ear of a user when the headphone is in use, a first microphone that is configured to receive a sound in the front air chamber including an external sound, the first microphone being provided in the front air chamber; the driver unit that is configured to emit a noise-canceling sound from the front side of the driver unit into the front air chamber, the noise-canceling sound canceling at least a part of the external sound included in the sound in the front air chamber received by the first microphone; a second microphone that is provided on the back side of the driver unit, wherein the second microphone is configured to receive an inverted noise-canceling sound, of which phase is opposite to the phase of the noise-canceling sound, emitted from a back side of the driver unit that is an opposite side of the front side of the driver unit; and a sound generating part that is configured to generate the noise-canceling sound by adding a signal based on the inverted noise-canceling sound received by the second microphone to a signal based on the sound in the front air chamber received by the first microphone, wherein the sound generating part has an attenuator that is configured to attenuate the inverted noise-canceling sound received by the second microphone to generate an attenuated signal, the attenuation amount in the attenuator is the same as the attenuation amount with which the noise-cancelling sound is attenuated in the process of becoming an attenuated noise-canceling sound by traveling from the driver unit to the first microphone, and a distance between the second microphone and a center position of the driver unit is less than a distance between the first microphone and the center position of the driver unit.