An in-the-ear device (300; 2000) comprising: a main body unit (310; 2010) configured to be inserted closer to the inside than a first curve of an external auditory canal and having a back surface that forms a surface substantially same as a surface of a cavum conchae; and an external auditory canal insertion unit (320; 2010) provided to protrude toward an inner section of the external auditory canal from a front surface of the main body unit, the external auditory canal insertion unit (320; 2010) including a sound conduit, a microphone unit (830; 2030) within the main body unit (310; 2010), wherein a sound receiving surface of the microphone unit (830; 2030) is in contact with an external world on a back surface side of the main body unit (310; 2010), and a driver unit (1430; 2040), wherein the driver unit and the microphone unit (830; 2030) are arranged within the main body unit (310; 2010) in this order from an inner side of the external auditory canal, characterized in that the in-the-ear device (300; 2000) further comprises a shielding unit, at least a portion of which sticks out from the back surface of the main body unit, wherein the shielding unit is flush with the sound receiving surface, the shielding unit has a size larger than that of an external auditory canal entrance, wherein in-the-ear device (300; 2000) further comprises a cable configured to transmit an audio signal obtained through a sound pickup by the microphone unit (830; 2030) to the outside, wherein the cable is inserted through an outlet hole formed on the shielding unit from an opposite side of the sound receiving surface and then discharged to the outside of the external auditory canal via the inside of the main body unit (310; 2010), wherein the outlet hole is disposed lower than a horizontal line passing through a center of the sound receiving surface. a main body unit (310; 2010) configured to be inserted closer to the inside than a first curve of an external auditory canal and having a back surface that forms a surface substantially same as a surface of a cavum conchae; and an external auditory canal insertion unit (320; 2010) provided to protrude toward an inner section of the external auditory canal from a front surface of the main body unit, the external auditory canal insertion unit (320; 2010) including a sound conduit, a microphone unit (830; 2030) within the main body unit (310; 2010), wherein a sound receiving surface of the microphone unit (830; 2030) is in contact with an external world on a back surface side of the main body unit (310; 2010), and a driver unit (1430; 2040), wherein the driver unit and the microphone unit (830; 2030) are arranged within the main body unit (310; 2010) in this order from an inner side of the external auditory canal, characterized in that the in-the-ear device (300; 2000) further comprises a shielding unit, at least a portion of which sticks out from the back surface of the main body unit, wherein the shielding unit is flush with the sound receiving surface, the shielding unit has a size larger than that of an external auditory canal entrance, wherein in-the-ear device (300; 2000) further comprises a cable configured to transmit an audio signal obtained through a sound pickup by the microphone unit (830; 2030) to the outside, wherein the cable is inserted through an outlet hole formed on the shielding unit from an opposite side of the sound receiving surface and then discharged to the outside of the external auditory canal via the inside of the main body unit (310; 2010), wherein the outlet hole is disposed lower than a horizontal line passing through a center of the sound receiving surface.