The established standard textbook in a thoroughly revised and expanded 7th edition, featuring numerous newly designed illustrations, new chapters on supersymmetric quantum mechanics and the theory of the measurement process, as well as over 100 exercises. In addition to the fundamentals and many applications, the author discusses new aspects of quantum theory and its experimental verification. The explicit presentation of all intermediate calculations helps students understand quantum mechanics more quickly and easily. It serves as the optimal preparation for "Quantum Mechanics for Advanced Students (QM II)" by the same author. In the appendix: mathematical tools and supplementary formulas.