A solar power generating device includes a first conductive body, a second conductive body and an insulating body sequentially disposed on the first conductive body, and a solar energy converting unit. The first conductive body has a conducting post upward projected from a hollow sleeve portion of the insulating body and a through opening of the second conductive body, so that a conducting section at a top of the conducting post is exposed at the insulating sleeve portion. The solar energy converting unit is mounted on the conducting section of the first conductive body and in electric contact with the second conductive body. With these arrangements, the solar power generating device may be mounted on a circuit board without the need of distinguishing the polarities of electrodes, and can therefore be easily mounted to and dismounted from the circuit board and be conveniently replaced when necessary.