A wall-mounted air-conditioning apparatus comprising: an air-conditioning apparatus main body; a front-face heat exchanger arranged on the main-body front-face side of the air-conditioning apparatus main body and a heat exchanger arranged on the main-body back face side; a cross flow fan which has an impeller disposed inside the main body of the air-conditioning apparatus main body, a stabilizer which separates the inside of the main body into an impeller suction region and an impeller blow-out region, and an arc-shaped guide wall disposed on the impeller blow-out region side, sucks air from the impeller suction region and blows out the sucked air into the impeller blow-out region; and a front grill disposed on the main-body front face, wherein an upper suction port is formed in the upper part of the main body of the air-conditioning apparatus main body; a suction opening is formed in the front grill, and a suction opening part whose opening is directed upward is formed by consecutively providing an air guide wall inclined downward inside the main body on the upper edge of the suction opening; and the suction opening is located between a part in the main-body height direction lower than a straight line A passing through a rotation center of the impeller and the closest contact point between the impeller and the front-face heat exchanger and a part in the main-body height direction higher than a straight line B in parallel with the straight line A and passing through the impeller and a tongue part of the stabilizer, characterized in that a suction-opening-side suction region angle θ1 formed by a straight line C which connects a distal end of an air guide wall of the suction opening to the impeller rotation center O and a straight line D which connects a closest contact point with the impeller in a tongue part of the stabilizer to the impeller rotation center O is formed so as to be 25 to 35°. an air-conditioning apparatus main body; a front-face heat exchanger arranged on the main-body front-face side of the air-conditioning apparatus main body and a heat exchanger arranged on the main-body back face side; a cross flow fan which has an impeller disposed inside the main body of the air-conditioning apparatus main body, a stabilizer which separates the inside of the main body into an impeller suction region and an impeller blow-out region, and an arc-shaped guide wall disposed on the impeller blow-out region side, sucks air from the impeller suction region and blows out the sucked air into the impeller blow-out region; and a front grill disposed on the main-body front face, wherein an upper suction port is formed in the upper part of the main body of the air-conditioning apparatus main body; a suction opening is formed in the front grill, and a suction opening part whose opening is directed upward is formed by consecutively providing an air guide wall inclined downward inside the main body on the upper edge of the suction opening; and the suction opening is located between a part in the main-body height direction lower than a straight line A passing through a rotation center of the impeller and the closest contact point between the impeller and the front-face heat exchanger and a part in the main-body height direction higher than a straight line B in parallel with the straight line A and passing through the impeller and a tongue part of the stabilizer, characterized in that a suction-opening-side suction region angle θ1 formed by a straight line C which connects a distal end of an air guide wall of the suction opening to the impeller rotation center O and a straight line D which connects a closest contact point with the impeller in a tongue part of the stabilizer to the impeller rotation center O is formed so as to be 25 to 35°.