Operational risk has recently become one of the key issues in financial institutions - there have been two main reasons for development of operational risk. First, there was the explicit incorporation of operational risk in the document called Basel II; second, there have been high losses from operational loss events. The insurance as one of operational risk's tool is the main point of the diploma thesis. In theoretical part, this tool is analyzed in relation to the operational risk (the insurability of operational risk, the main characteristic of insurance, the obstacles in the usage of this tool, its relation to capital and capital adequacy, benefits and negatives of this tool). In practical part, the use of insurance as operational risk ...