Antenna device

An antenna device being provided inside a door handle of a vehicle, the antenna device comprising:

• a main body that extends in a longitudinal direction of the door handle;
• a first antenna that is provided at a grip portion of the door handle, and transmits a radio wave in a first frequency band;
• a second antenna that receives a radio wave in a second frequency band higher than the first frequency band;
• a receiver that processes a signal based on the radio wave received by the second antenna;
• and
• an inner case accommodated in the main body, the inner case including a container-shaped portion and a support plate, the container-shaped portion accommodates the second antenna and the receiver inside the door handle and the first antenna is supported on the support plate, wherein,
• in the inner case, the first antenna and the second antenna are arranged along the longitudinal direction of the door handle,
• the inner case includes a plurality of walls extending in a lateral direction of the door handle that completely surround and define the container-shaped portion,
• the plurality of walls include an upper wall portion, a lower wall portion, a front wall portion, and a back wall portion that surround the container-shaped portion,
• the upper wall portion and the lower wall portion face each other,
• the front wall portion and the back wall portion face each other, and
• the support plate extends rearward from the back wall portion.