Opening/closing structure of window

The present invention relates to an opening/closing structure of window, which includes: a first window plate, a second window plate and a drive unit. The first window plate is disposed with a first hinge, and the first hinge is formed with a first shaft tube. The second window plate is disposed with a second hinge, and the second hinge is formed with a second shaft tube. A pivotal shaft is used to concatenate the first shaft tube and the second shaft tube. The drive unit includes a worm gear disposed in the pivotal shaft, a base disposed in the second window plate, a worm shaft driven by a power source, and an elastic member. The worm shaft includes a shaft part and a worm part engaged with the worm gear. The base is formed with a wedge-shaped groove and a space for accommodating the worm part and a moving member, the wedge-shaped groove is assembled with a wedge-shaped block, the space is communicated with the wedge-shaped groove and allows the moving member to displace. The moving member is assembled with