A connector structure comprising: a first connector that includes a first connector housing in which a first terminal is housed, and an engagement arm that can be elastically bent; and a second connector that includes a second connector housing in which a second terminal is housed, a slider that is provided on the second connector housing slidably in a connector coupling direction and a connector decoupling direction, a biasing portion that biases the second connector housing in the connector decoupling direction, and an arm engagement portion engaged with the engagement arm when the engagement arm is elastically bent back, wherein, during a coupling process of the first connector and the second connector, the slider is slid by a pressing force applied from the first connector against a biasing force generated by the biasing portion, in a coupling completion state, the engagement arm is engaged with the arm engagement portion to lock the first connector and the second connector, characterized in that the biasing portion includes an elastically-bendable arm that is provided on the slider, and a tapered surface that is provided on the second connector housing and contacts with the elastically-bendable arm to bend the elastically-bendable arm during the coupling process, and in that the biasing force is generated as a reaction force of an elastically-restorative force of the elastically-bendable arm bent by the tapered surface. a first connector that includes a first connector housing in which a first terminal is housed, and an engagement arm that can be elastically bent; and a first connector housing in which a first terminal is housed, and an engagement arm that can be elastically bent; and a second connector that includes a second connector housing in which a second terminal is housed, a slider that is provided on the second connector housing slidably in a connector coupling direction and a connector decoupling direction, a biasing portion that biases the second connector housing in the connector decoupling direction, and an arm engagement portion engaged with the engagement arm when the engagement arm is elastically bent back, a second connector housing in which a second terminal is housed, a slider that is provided on the second connector housing slidably in a connector coupling direction and a connector decoupling direction, a biasing portion that biases the second connector housing in the connector decoupling direction, and an arm engagement portion engaged with the engagement arm when the engagement arm is elastically bent back, wherein, during a coupling process of the first connector and the second connector, the slider is slid by a pressing force applied from the first connector against a biasing force generated by the biasing portion, in a coupling completion state, the engagement arm is engaged with the arm engagement portion to lock the first connector and the second connector, characterized in that the biasing portion includes an elastically-bendable arm that is provided on the slider, and a tapered surface that is provided on the second connector housing and contacts with the elastically-bendable arm to bend the elastically-bendable arm during the coupling process, and in that the biasing force is generated as a reaction force of an elastically-restorative force of the elastically-bendable arm bent by the tapered surface.