PROBLEM TO BE SOLVED: To provide an antenna device capable of improving durability against an addition of excessive external force.SOLUTION: An antenna device 4 that receives a radio signal by a capsule type medical device introduced to a subject includes: an antenna sheet 40 including a flexible base material 41, a step part formed on the base material 41, and wiring patterns 44A-44H formed on the base material 41, intersecting with the step part a holder 7 for accommodating the base material 41 of the antenna sheet and flexible protection sheets 8A and 8B for covering at least a portion intersecting with the step part of the wiring patterns 44A-44H in the holder 7 when the base material 41 of the antenna sheet 40 is accommodated in the holder 7.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2017,JPO&INPIT
