a television tuner contains a mixer unit for converting a television signal into an intermediate frequency signal and an intermediate frequency tuning circuit provided at the next stage of the mixer unit for passing the intermediate frequency signal . the intermediate frequency tuning circuit is switched such that a tuning frequency has different values according to whether the television signal is at least a weak electric field or a strong electric field . the tuning frequency is tuned to a frequency close to a picture intermediate frequency when the television signal is at least the weak electric field , and the tuning frequency is tuned to a frequency close to a sound intermediate frequency when the television signal is at least the strong electric field .