The book is a record of lectures delivered by R. Feynman, in which the author set himself the task of giving a relatively brief summary of the methods and main results of quantum electrodynamics, calculated primarily on experimental physicists. The reader will find what is necessary that will allow him to learn how to calculate the probabilities of various electromagnetic processes and understand the basic problems of quantum electrodynamics. The simplicity of the presentation will attract the attention of many readers, including those for whom modern quantum electrodynamics has so far seemed inaccessible.