Disclosed is a polarizing plate which is characterized in that a protective film is on at least one side of the plate, and that the protective film is bonded with a polarizing element using an adhesive which contains at least a polymerized product of a diallylamine compound. Also disclosed is the adhesive. The adhesive can bond a polarizing element with a protective film or the like which uses not only TAC but also an acrylic resin film, an olefin resin film (a cycloolefin film or a polyolefin film) and the like, without adversely affecting the polarizing element or a surface treatment layer. The polarizing plate obtained by using the adhesive has excellent wet heat resistance and water resistance.