The diploma thesis is focused on a composition of the business plan, which serves as a basis for establishing car sharing company. The thesis is consisted of three main parts, part theoretical, methodological and practical. The main purpose of the theoretical-methodological part is to explain the role, importance, structure and recommended process of designing business plans. Theoretical-methodological part also contains description of the tools of situation analysis, which are used in the practical part. The main goal of the thesis is to draw up the business plan of a fictitious company Sdílej auto, s.r.o., which operates on a market with car sharing services. In this part the basic market research was done, including PESTE analysis, Porter's five forces analysis and SWOT analysis, which allows to understand and evaluate the business environment. The practical feasibility of the plan is verified by financial plan