A speaker device, for a mobile communication terminal, for outputting a sound, comprising: a first speaker unit; a second speaker unit; and a housing having an internal space divided by diaphragms formed inside the internal space into a mounting space for mounting the first speaker unit and a resonant space, wherein the housing further includes a sound passage formed by the diaphragms, and wherein the second speaker unit is mounted at a distal end portion of the sound passage, wherein the speaker device further comprises: an amplifier comprising an input terminal to which a first input audio signal is inputted, and outputting a first audio signal, wherein the first speaker unit is connected to an output terminal of the amplifier, the first speaker unit outputting a first sound from the first audio signal, wherein the mounting space and the sound passage are arranged such that a rear side sound of the first speaker unit moves along the sound passage and arrives at the distal end portion of the sound passage where the second speaker unit is mounted, wherein the second speaker unit is connected to the input terminal of the amplifier, and wherein the second speaker unit outputs a second sound from the first input audio signal such that the rear side sound outputted from the rear side of the first speaker unit arriving at the distal end portion of the sound passage is dampened by the second sound outputted by the second speaker unit. a first speaker unit; a second speaker unit; and a housing having an internal space divided by diaphragms formed inside the internal space into a mounting space for mounting the first speaker unit and a resonant space, wherein the housing further includes a sound passage formed by the diaphragms, and wherein the second speaker unit is mounted at a distal end portion of the sound passage, wherein the speaker device further comprises: an amplifier comprising an input terminal to which a first input audio signal is inputted, and outputting a first audio signal, wherein the first speaker unit is connected to an output terminal of the amplifier, the first speaker unit outputting a first sound from the first audio signal, wherein the mounting space and the sound passage are arranged such that a rear side sound of the first speaker unit moves along the sound passage and arrives at the distal end portion of the sound passage where the second speaker unit is mounted, wherein the second speaker unit is connected to the input terminal of the amplifier, and wherein the second speaker unit outputs a second sound from the first input audio signal such that the rear side sound outputted from the rear side of the first speaker unit arriving at the distal end portion of the sound passage is dampened by the second sound outputted by the second speaker unit. an amplifier comprising an input terminal to which a first input audio signal is inputted, and outputting a first audio signal, wherein the first speaker unit is connected to an output terminal of the amplifier, the first speaker unit outputting a first sound from the first audio signal, wherein the mounting space and the sound passage are arranged such that a rear side sound of the first speaker unit moves along the sound passage and arrives at the distal end portion of the sound passage where the second speaker unit is mounted, wherein the second speaker unit is connected to the input terminal of the amplifier, and wherein the second speaker unit outputs a second sound from the first input audio signal such that the rear side sound outputted from the rear side of the first speaker unit arriving at the distal end portion of the sound passage is dampened by the second sound outputted by the second speaker unit.