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An analytical expression is obtained for the mass of an isolated magneticskyrmion and its linearized equation of motion. The magnetic skyrmion is viewedas a topologically protected spin-wave soliton in the magnetic ultrathin filmsstabilized by the interfacial-Dzyaloshinskii-Moriya interaction. The equationsof motion are derived from the Landau-Lifshitz-Gilbert equation for both theskyrmion charge and magnetization centers. They are generalized Thieleequations, including the gyro-term, dissipation term, external force,acceleration term with the tensorial mass, and time derivatives of the externalforces. The equation of motion of the center of the skyrmion charge essentiallyshows the massless nature of the skyrmion. In contrast, the equation of motionfor the magnetization center results in a finite mass that is in the same orderas the Doring mass density for the linear domain wall. Furthermore, the timederivative of the external force predominantly contributes to the immediateresponse of the skyrmion motion, i.e., the mass-less property remains evenafter the skyrmion acquires its kinetic mass.  A micromagnetic simulation based on the LLG equation was performed forvarious magnetic parameters. Obtained trajectories at 0 K are compared with thetheoretical predictions.

Mass and generalized Thiele equation of the magnetic skyrmion