A variable impedance matching device is provided to facilitate impedance matching in an installation field by variably performing the impedance matching. A variable impedance matching device performs the stub impedance matching. The variable impedance matching device includes a branch stub(200), a main stub(100), and a junction. The branch stub has a branch core(210). The short position of the branch core is varied. The branch stub moves along the length direction of the main stub. The main stub has a main core(110). The junction has a first junction(300a) and a second junction(300b). The first junction connects one end of the main stub and the coaxial cable of the antenna side. The second junction connects the other end of the main stub and the coaxial cable of the power side.
