An opening device for a solid material package includes a package supporting unit for fixedly supporting a main body of a solid material package having a pair of pulling flaps, an opening unit formed from grips for gripping the pair of pulling flaps so that an opening angle formed by the pair of pulling flaps is 10.degree. to 180.degree., a pair of movable pieces for supporting the grips, and pulling units for pulling the pair of movable pieces to open the package, and a moving unit for moving the package supporting unit upward in conjunction with the pulling unit such that the solid material package is caused to move upward as the movable pieces grip the pulling flaps with the grips and the pulling units pull the movable pieces within the opening angle to peel off a seal section of the solid material package to discharge the solid material from the package.