An air conditioner (2-1, 2-2), comprising: a temperature detection unit configured to detect an indoor temperature; a human body detection unit configured to rotatably operate and detect a person within an indoor area; a position determination unit configured to determine a position of the person based on data detected by the human body detection unit; and a control unit adapted to control a current of air, in the case where an automatic operation mode has been set, wherein the control unit is configured to: perform an automatic operation to control the current of air according to the position of the person determined by the position determination unit, if the indoor temperature reaches a first reference temperature, perform a preparation operation to prepare for execution of the automatic operation if the indoor temperature does not reach the first reference temperature, the preparation operation comprising the control unit setting directions of the current of air so that up and down discharge angles of the current of air are horizontal to the surface of land and the current of air has full swing in left and right directions, and controlling the preparation operation so that the preparation operation operates by a maximum air volume of the current of air, and stop the automatic operation and perform the preparation operation if, during the automatic operation, the indoor temperature reaches or exceeds a second reference temperature set higher than the first reference temperature, wherein the first and second reference temperatures are set according to a desired temperature and such that the higher the desired temperature, the greater the difference between the second and first reference temperatures. a temperature detection unit configured to detect an indoor temperature; a human body detection unit configured to rotatably operate and detect a person within an indoor area; a position determination unit configured to determine a position of the person based on data detected by the human body detection unit; and a control unit adapted to control a current of air, in the case where an automatic operation mode has been set, wherein the control unit is configured to: perform an automatic operation to control the current of air according to the position of the person determined by the position determination unit, if the indoor temperature reaches a first reference temperature, perform a preparation operation to prepare for execution of the automatic operation if the indoor temperature does not reach the first reference temperature, the preparation operation comprising the control unit setting directions of the current of air so that up and down discharge angles of the current of air are horizontal to the surface of land and the current of air has full swing in left and right directions, and controlling the preparation operation so that the preparation operation operates by a maximum air volume of the current of air, and stop the automatic operation and perform the preparation operation if, during the automatic operation, the indoor temperature reaches or exceeds a second reference temperature set higher than the first reference temperature, wherein the first and second reference temperatures are set according to a desired temperature and such that the higher the desired temperature, the greater the difference between the second and first reference temperatures. perform an automatic operation to control the current of air according to the position of the person determined by the position determination unit, if the indoor temperature reaches a first reference temperature, perform a preparation operation to prepare for execution of the automatic operation if the indoor temperature does not reach the first reference temperature, the preparation operation comprising the control unit setting directions of the current of air so that up and down discharge angles of the current of air are horizontal to the surface of land and the current of air has full swing in left and right directions, and controlling the preparation operation so that the preparation operation operates by a maximum air volume of the current of air, and stop the automatic operation and perform the preparation operation if, during the automatic operation, the indoor temperature reaches or exceeds a second reference temperature set higher than the first reference temperature, wherein the first and second reference temperatures are set according to a desired temperature and such that the higher the desired temperature, the greater the difference between the second and first reference temperatures.