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 (A), the first microphone being provided in the front air chamber ; the driver unit that is configured to emit a noise-canceling sound (B1) from the front side of the driver unit into the front air chamber , the noise-canceling sound (B1) canceling at least a part of the external sound (A) 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 (B3), of which phase is opposite to the phase of the noise-canceling sound (B1), 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 (B1) by adding a signal based on the inverted noise-canceling sound (B3) 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 (B3) 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 (B1) is attenuated in the process of becoming an attenuated noise-canceling sound (B2) 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 (A), the first microphone being provided in the front air chamber ; the driver unit that is configured to emit a noise-canceling sound (B1) from the front side of the driver unit into the front air chamber , the noise-canceling sound (B1) canceling at least a part of the external sound (A) 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 (B3), of which phase is opposite to the phase of the noise-canceling sound (B1), 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 (B1) by adding a signal based on the inverted noise-canceling sound (B3) 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 (B3) 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 (B1) is attenuated in the process of becoming an attenuated noise-canceling sound (B2) 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 . <EOS>