An air conditioner comprising: a main body that comprises a suction port (2a, 2b) and an outlet port; a blowing portion that is disposed inside said main body; and a heat exchanging portion that is disposed inside said main body, wherein said main body includes a front surface, a back surface, an upper surface, a lower surface, and a pair of side surfaces; said suction port (2a, 2b) is formed on any of said front surface, said upper surface, and said side surfaces; said outlet port is formed on at least said lower surface; an outlet air channel is upstream from said outlet port; a side of said outlet air channel near said front surface is delimited by a diffuser; said diffuser comprises a portion that diverges from an upstream portion imaginary straight line that constitutes a direction of extension of an upstream portion (3a1) of said diffuser increasingly toward a downstream end of said diffuser when viewed from a side; a stabilizer is disposed below said heat exchanging portion, said diffuser being formed on a lower surface of said stabilizer; said suction port is formed on said front surface of said main body and being disposed within a range that is lower than an upper end of said blowing portion and higher than an upper end of said stabilizer in a height direction of said main body; an airflow guiding wall is disposed downstream from said suction port; the air conditioner being characterized in that said airflow guiding wall has an L-shaped cross section comprising: a horizontal surface (6a1) that extends horizontally toward a back surface side of said main body; and a downward surface (6a2) that extends downward, wherein said suction port is formed on said front surface of said main body and has an opening that has a length that corresponds or is longer than a length in a width direction of at least said heat exchanging portion. a main body that comprises a suction port (2a, 2b) and an outlet port; a blowing portion that is disposed inside said main body; and a heat exchanging portion that is disposed inside said main body, wherein said main body includes a front surface, a back surface, an upper surface, a lower surface, and a pair of side surfaces; said suction port (2a, 2b) is formed on any of said front surface, said upper surface, and said side surfaces; said outlet port is formed on at least said lower surface; an outlet air channel is upstream from said outlet port; a side of said outlet air channel near said front surface is delimited by a diffuser; said diffuser comprises a portion that diverges from an upstream portion imaginary straight line that constitutes a direction of extension of an upstream portion (3a1) of said diffuser increasingly toward a downstream end of said diffuser when viewed from a side; a stabilizer is disposed below said heat exchanging portion, said diffuser being formed on a lower surface of said stabilizer; said suction port is formed on said front surface of said main body and being disposed within a range that is lower than an upper end of said blowing portion and higher than an upper end of said stabilizer in a height direction of said main body; an airflow guiding wall is disposed downstream from said suction port; the air conditioner being characterized in that said airflow guiding wall has an L-shaped cross section comprising: a horizontal surface (6a1) that extends horizontally toward a back surface side of said main body; and a downward surface (6a2) that extends downward, wherein said suction port is formed on said front surface of said main body and has an opening that has a length that corresponds or is longer than a length in a width direction of at least said heat exchanging portion. a horizontal surface (6a1) that extends horizontally toward a back surface side of said main body; and a downward surface (6a2) that extends downward, wherein said suction port is formed on said front surface of said main body and has an opening that has a length that corresponds or is longer than a length in a width direction of at least said heat exchanging portion.