The present invention relates to a linear compressor, and more specifically, to a linear compressor capable of providing greater power by varying a frequency during the high load condition. The linear compressor of the present invention comprises: a fixed member which includes a compression space inside; a movable member which linearly reciprocates inside the fixed member, and compresses refrigerant sucked into the compression space; at least one spring which is configured to elastically support the movable member in a moving direction of the movable member; a mechanical unit which includes a motor that is configured to connect with the movable member and allows the movable member to linearly reciprocate in an axial direction; a rectification unit which receives AC power, and outputs the AC power as a DC voltage; an inverter unit which is applied with the DC voltage, converts the DC voltage into an AC voltage according to a control signal, and provides the AC voltage to the motor; a voltage sensor which senses the DC voltage outputted by the rectification unit; a current sensor which senses a current flowing between the motor and the inverter unit; and an electric control unit including a controller, which controls a necessary voltage of the motor from the current of the current sensor, and applies the control signal to the inverter unit by generating the control signal for controlling so that a frequency of the AC voltage converted by the inverter unit may be changed, if the necessary voltage is larger than the DC voltage of the voltage sensor.