An inductor device includes a first and a second inductor unit. The first inductor unit includes a first and a second wire. The first wire is winded to form circles. The second wire is winded with the first wire to form circles. The first and/or the second wire are winded in an interlaced manner at a first terminal, a second terminal, a first side, and a second side. The second inductor unit includes a third and a fourth wire. The third wire is winded to form circles. The fourth wire is winded with the third wire to form circles. The third and/or the fourth wire are winded in an interlaced manner at a third terminal, a fourth terminal, a third side, and a fourth side. The first wired is coupled to the fourth wired, and the second wired is coupled to the third wired.