A vehicular antenna device comprising: a first antenna operable in a first frequency band; a second antenna operable in a second frequency band different from the first frequency band; a first feeding unit connected to the first antenna; a second feeding unit connected to the second antenna; and a combiner unit combining a signal from the first feeding unit and a signal from the second feeding unit; characterized in that the vehicular antenna device further comprises at least one of: i) a first filter circuit located between the first feeding unit and the combiner unit in an electrical path, the first filter circuit blocking a signal in the second frequency band, wherein a length of a transmission line between the first filter circuit and the combiner unit is equal to or smaller than 1/8 times a wavelength of a signal propagating in the transmission line at a maximum frequency in the second frequency band; and ii) a second filter circuit located between the second feeding unit and the combiner unit in the electrical path, the second filter circuit blocking a signal in the first frequency band, wherein a length of a transmission line between the second filter circuit and the combiner unit is equal to or smaller than 1/8 times a wavelength of a signal propagating in the transmission line at a maximum frequency in the first frequency band. a first antenna operable in a first frequency band; a second antenna operable in a second frequency band different from the first frequency band; a first feeding unit connected to the first antenna; a second feeding unit connected to the second antenna; and a combiner unit combining a signal from the first feeding unit and a signal from the second feeding unit; characterized in that the vehicular antenna device further comprises at least one of: i) a first filter circuit located between the first feeding unit and the combiner unit in an electrical path, the first filter circuit blocking a signal in the second frequency band, wherein a length of a transmission line between the first filter circuit and the combiner unit is equal to or smaller than 1/8 times a wavelength of a signal propagating in the transmission line at a maximum frequency in the second frequency band; and ii) a second filter circuit located between the second feeding unit and the combiner unit in the electrical path, the second filter circuit blocking a signal in the first frequency band, wherein a length of a transmission line between the second filter circuit and the combiner unit is equal to or smaller than 1/8 times a wavelength of a signal propagating in the transmission line at a maximum frequency in the first frequency band. i) a first filter circuit located between the first feeding unit and the combiner unit in an electrical path, the first filter circuit blocking a signal in the second frequency band, wherein a length of a transmission line between the first filter circuit and the combiner unit is equal to or smaller than 1/8 times a wavelength of a signal propagating in the transmission line at a maximum frequency in the second frequency band; and ii) a second filter circuit located between the second feeding unit and the combiner unit in the electrical path, the second filter circuit blocking a signal in the first frequency band, wherein a length of a transmission line between the second filter circuit and the combiner unit is equal to or smaller than 1/8 times a wavelength of a signal propagating in the transmission line at a maximum frequency in the first frequency band.