A shield structure includes a main body portion and a lid portion. An electronic circuit is stored in the main body portion. The lid portion is attached to the main body portion in a detachable manner, and includes a first contact portion. The main body portion includes an opening portion, a second contact portion, and a pressurizing portion. When the first contact portion moves in a direction perpendicular to a direction of the lid portion attached to the main body portion, in a state of being inserted in the opening portion, the first contact portion is elastically deformed in a first direction by contacting the second contact portion and comes into pressure contact with the second contact portion. When the first contact portion is inserted in the opening portion, the pressurizing portion contacts and pressurizes the first contact portion in a second direction opposite to the first direction.