[en] Boundary layer analysis of forced magnetic reconnection due to a boundary perturbation is revised. This revised analysis introduces correct asymptotic matching to take into account the effect of inertia in the inner layer precisely. The initial evolution of a new reconnection process is characterized by some significant features. One is that a reconnected flux increases on the same time scale as the boundary perturbation, which excludes the Sweet-Parker time scale obtained by use of the constant-ψ asymptotic matching. Another is that an induced surface current on a resonant surface is in such a direction as to oppose the progress of the reconnection. Moreover an equation for the time evolution of the reconnected flux is proposed in terms of an integral equation. (author)