To provide an adhesive sheet that can be easily and accurately mounted to the specified location of a base material and can also be removed easily from the base material, and also to provide a holding jig provided with the same adhesive sheet.

In this adhesive sheet, a non-adhesive part or a weak adhesive part and a strong adhesive part are provided at the front surface that is loaded to the base material 20 including a ventilation hole 21 for ventilating a gas, the strong adhesive part adhesively holds an object to be adhered 30, the non-adhesive part of the weak adhesive part is protruded from the base material 20 or the strong adhesive part is depressed to the side of the base material 20 by pressuring or exhausting the gas from the ventilating hole 21, and the object to be adhered 30 can be separated. The adhesive sheet 10 comprises, at the area near the end part of the adhesive sheet 10, an X direction regulation part 11 and a Y direction regulation part 12 for positioning in the X direction and Y direction for the specified location of the base material 20, in the virtual XY coordinates in the flat surface. The holding jig 1 is provided with the adhesive sheet 10 and the base material 20 including the ventilating hole 21 for supplying the gas in order to fix the adhesive sheet 10.