An LED lamp comprising a pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d); a rectifier circuit unit adapted to rectify an external AC current, inputted from the outside to the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d), to a DC current; and an LED unit adapted to emit light by electrification of the DC current outputted from the rectifier circuit unit; the LED lamp further comprising: a current detection unit adapted to detect a magnitude of the DC current flowing through the LED unit; and a PWM control unit coupled between the rectifier circuit unit and the LED unit, wherein the PWM control unit is adapted to perform PWM control of the DC current flowing through the LED unit according to a duty ratio; characterized by a variable inductance unit (L50, L60) coupled between the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) and the rectifier circuit unit, wherein the variable inductance unit (L50, L60) is adapted to cause the external AC current to flow from one of the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) to the other one of the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) through the rectifier circuit unit; and an inductance variable control unit adapted to make an inductance value of the variable inductance unit (L50, L60) variable according to the magnitude of the DC current detected by the current detection unit; a bypass circuit unit coupled between a cathode-side terminal of the LED unit and a ground-side output terminal of the rectifier circuit unit, wherein the bypass circuit unit is adapted to bypass the PWM control unit to prevent the PWM control unit from performing the PWM control when a frequency of the external AC current inputted to the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) is higher than a predetermined frequency, and wherein the bypass circuit unit is further adapted not to bypass the PWM control until so that the PWM control unit performs the PWM control when the frequency of the external AC current inputted to the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) is lower than the predetermined frequency; wherein the current detection unit is coupled between the bypass circuit unit and the ground-side output terminal of the rectifier circuit unit; and wherein, in the case where the PWM control unit does not perform PWM control, the current detection unit is adapted to detect the magnitude of the DC current flowing through the LED unit, and the inductance variable control unit is adapted to make the inductance value of the variable inductance unit (L50, L60) variable according to the magnitude of the detected DC current. a current detection unit adapted to detect a magnitude of the DC current flowing through the LED unit; and a PWM control unit coupled between the rectifier circuit unit and the LED unit, wherein the PWM control unit is adapted to perform PWM control of the DC current flowing through the LED unit according to a duty ratio; a variable inductance unit (L50, L60) coupled between the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) and the rectifier circuit unit, wherein the variable inductance unit (L50, L60) is adapted to cause the external AC current to flow from one of the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) to the other one of the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) through the rectifier circuit unit; and an inductance variable control unit adapted to make an inductance value of the variable inductance unit (L50, L60) variable according to the magnitude of the DC current detected by the current detection unit; a bypass circuit unit coupled between a cathode-side terminal of the LED unit and a ground-side output terminal of the rectifier circuit unit, wherein the bypass circuit unit is adapted to bypass the PWM control unit to prevent the PWM control unit from performing the PWM control when a frequency of the external AC current inputted to the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) is higher than a predetermined frequency, and wherein the bypass circuit unit is further adapted not to bypass the PWM control until so that the PWM control unit performs the PWM control when the frequency of the external AC current inputted to the pair (20a, 20c; 20b, 20d) of input terminal parts (20a, 20b, 20c, 20d) is lower than the predetermined frequency;