An air conditioner comprising: a discharge opening through which an air current is discharged to air-condition an interior of a room; a wind direction changing blade operable to change a direction in which the air current is discharged; a wind-direction-changing-blade control means operable to drive the wind direction changing blade to change an angle thereof; a human body detecting means disposed adjacent to the discharge opening to detect a human body upon receipt of infrared rays; and a human body situation determining means operable to determine a human body situation including at least one of presence or absence, a position and an amount of activity of a person based on detection information of the human body detecting means; wherein an operation setting is changed based on a determination result of a human body situation obtained from the human body situation determining means; and wherein detection information of the human body detecting means outputted in a time zone including a period of time from when the wind-direction-changing-blade control means starts changing a set angle of the wind direction changing blade to when the wind-direction-changing-blade control means terminates changing the set angle of the wind direction changing blade and a subsequent period of time until a predetermined period of time elapses from the termination of the change is not utilized for a determination of the human body situation by the human body situation determining means, and wherein detection information of the human body detecting means outputted in a stoppage period for changing a set angle of the wind direction changing blade is utilized for a determination of the human body situation by the human body situation determining means. a discharge opening through which an air current is discharged to air-condition an interior of a room; a wind direction changing blade operable to change a direction in which the air current is discharged; a wind-direction-changing-blade control means operable to drive the wind direction changing blade to change an angle thereof; a human body detecting means disposed adjacent to the discharge opening to detect a human body upon receipt of infrared rays; and a human body situation determining means operable to determine a human body situation including at least one of presence or absence, a position and an amount of activity of a person based on detection information of the human body detecting means; wherein an operation setting is changed based on a determination result of a human body situation obtained from the human body situation determining means; and wherein detection information of the human body detecting means outputted in a time zone including a period of time from when the wind-direction-changing-blade control means starts changing a set angle of the wind direction changing blade to when the wind-direction-changing-blade control means terminates changing the set angle of the wind direction changing blade and a subsequent period of time until a predetermined period of time elapses from the termination of the change is not utilized for a determination of the human body situation by the human body situation determining means, and wherein detection information of the human body detecting means outputted in a stoppage period for changing a set angle of the wind direction changing blade is utilized for a determination of the human body situation by the human body situation determining means.