The work is dedicated to the problem of reconstruction of early period of the forming of mythological tradition of early Germans, on the basis of the concrete monuments of Scandinavian Bronze Age rock art. Some ethno-chronological groups are picked out, and those concerning to that period are analysed. Some rock art monuments and some common objects are compared with the petroglyphs of Karelia genetically connected with. Approximate interpretation of some rock art scenes in mythological aspect is given. Attention is paid on the cults of the Serpent, Sun boat, Sky Reindeer, relating the ideology of Northern Hunters and the Southern one of Agricultural societies.