The paper deals with the theoretical and practical aspects that are necessary for identifying of modal parameters of the gear wheel as a component of the planetary gear mechanism, which are basic for the dynamic analysis. The paper presents thematically integrated part of the results of numerical and experimental modal analysis conducted on a particular gear wheel. The paper aimed to create experimental and computational model and subsequent verification of selected theories in defining the modal parameters, comparing results obtained numerical and experimental modal analysis and assessment of dynamic characteristics of the component with respect to its operating conditions. Numerical analysis was carried out in a computer CAD/CAM program PTC Creo, which works on the Finite Element Method. The results obtained by experimental modal analysis were evaluated by measuring system PULSE.Experimental measurements have shown that the values of natural frequencies along with the natural shapes are adequate and that no natural frequency is not the same or close to the gear frequency, so the component can be used in the real practice.