Abstract: An antenna device includes a feeder circuit, a patch antenna, an antenna, a first coil connected between the feeder circuit and the patch antenna, and a second coil connected to the antenna and magnetically coupled to the first coil. The patch antenna resonates in a first frequency range in a first direction and in a second frequency range in a second direction. The antenna resonates in a third frequency range. A first center frequency refers to the center frequency of the first frequency range, a second center frequency refers to the center frequency of the second frequency range, a third center frequency refers to the center frequency of the third frequency range, and an absolute value of a difference between the first center frequency and the third center frequency is less than an absolute value of a difference between the second center frequency and the third center frequency.