A silicone self-adhesive comprising an organopolysiloxane obtained by partial condensation of from 40 to 80 parts by weight of a diorganopolysiloxane containing at least an alkenyl group and a aryl group and correspondingly from 60 to 20 parts by weight of a copolymer which consists essentially of SiO.sub.2 units and R'.sub.3 SiO.sub.0.5 units, in which each R' represents a monovalent hydrocarbon group having not larger than 3 carbon atoms, at a mixing ratio by mole of from 1:0.3 to 1:1.5 and which has at least one hydroxyl group directly bonded to a silicon atom in the molecule, and an organohydrogenpolysiloxane used in an amount sufficient to give from 1 to 30 Si-H bonds per one vinyl group of the above ingredient. A catalytically effective amount of a platinum catalyst is added to the above self-adhesive. An self-adhesive tape or sheet using the above self-adhesive is also provided.
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