A saddle for bicycles has a vertical swiveling unit and a horizontal sliding unit so that the saddle is moved vertically and horizontally, thus providing a sensation similar to riding a horse. The saddle includes a seat sliding unit providing on a lower surface of a seat to move the seat forward and backward, as a user moves forward and backward while sitting on the seat. A guide part with a predetermined length supports the seat sliding unit to guide a horizontal movement of the seat sliding unit, with a free end provided at a rear end of the guide part to allow the guide part to be swiveled vertically. A swiveling spring is provided at a front end of the guide part to provide a vertical elastic force to the guide part. A support part supports the swiveling spring and couples the support part to the seat support frame.