A movable connector is used to reduce the displacement load of a spring portion in order to improve the workability of insertion and extraction of a movable connector. A spring portion (5k) has an upper piece portion (5d) and a lower piece portion (5f) having a linear shape, and is formed in such a rectangular wave shape that an outer vertical piece portion (5c) having a linear portion extends from an end of the upper piece portion (5d), a central vertical piece portion (5e) having a linear shape and connected to an end of the lower piece portion (5f) extends from the other end of the upper piece portion (5d), and an inner vertical piece portion (5g) having a linear shape extends from the other end of the lower piece portion (5f). The spring portion (5k) is the rectangular wave shape by connecting a plurality spring piece angle portions (5m) having linear shapes so as to change the stress generated by the spring portion (5k) to be smaller than the stress generated by the spring portionhaving an arched wave shape of a bending buckling portion in the prior art, and therefore the shifting load of the spring portion (5k) required by the shifting of a movable housing (4) is reduced.