A fixing structure includes: a shield electric wire; a shield shell having a small diameter part having a hollow tubular-shape through which the exposed part passes, and an outer periphery being covered with an end of a peeled braided part of the shield electric wire, and a main body part having a hollow shape extended from the small diameter part and through which the shield electric wire passes; a shield ring clamped to the small diameter part under a state that the end of the peeled braided part is located between the shield ring and the small diameter part; and an inner holder that is inserted into and fixed to an inner part of the main body part under a state that the shield electric wire passes through the inner holder.