A connection structure of a carbon nanotube wire is provided, which includes a joint between the carbon nanotube wire and the connection target having excellent electrical connectivity and mechanical connectivity. The present disclosure provides a connection structure of a carbon nanotube wire, including: a carbon nanotube wire formed by twisting and bundling carbon nanotube aggregates; a connection target to which the carbon nanotube wire is connected; a conducting wire with higher solder wettability than the carbon nanotube wire; a penetrating part of the conducting wire formed along a cross section having a component orthogonal to a longitudinal direction of the carbon nanotube wire; and solder that connects the carbon nanotube wire and the connection target, in which the solder penetrates the penetrating part formed along the conducting wire.