A method for manufacturing a terminal-equipped electric wire includes forming, in an electric wire, a bonded portion in which strands of a conductor exposed due to absence of a sheath are bonded to each other. A terminal including a wire barrel portion is fixed to the electric wire such that the wire barrel portion covers at least a part of the bonded portion. A sectional shape of the bonded portion before the fixing of the terminal is formed in such a shape that a variable range of a value of a distance between a geometric center of a cross section of the bonded portion and the wire barrel portion falls within a range of 0.71 to 1.29 when rotating the bonded portion by an arbitrary angle while engaging the bonded portion with the wire barrel portion within the wire barrel portion.