The textbook describes the issues of calculation and design of metal structures of construction and road machines. General methods of calculation of structural units for strength, stability and endurance are given. Recommendations are given on the choice of steel grades for machines operating at low temperatures. The method of calculation of metal structures by limit states is widely used. Attention is paid to the structural elements of the nodes of construction and road machines. Methods of solving problems to determine the stressed state of structures are given. The presentation uses the results of theoretical and experimental studies of machine metal structures conducted in recent years. The textbook is intended for students of engineering, construction, road and polytechnic universities. It can be useful for engineers involved in the research, design and calculation of construction and road machines.