Five sharp absorption lines of Mn(CH 3 COO) 2 ·4H 2 O were found in the violet region at liquid helium temperature. The line at 24,496 cm -1 and the quartet lines between 24,695 cm -1 and 24,770 cm -1 were assigned to the transitions from the ground state 6 A 1 to the excited states 4 A 1 and 4 E respectively. These transitions are caused by an electric dipole. The magnetic field dependence of relative intensities of these lines at 1.3°K was investigated, and it was concluded that the ordered state below 3.18°K is ferrimagnetic, that the preferred axis is the a axis and that the most difficult axis is the b axis. The results of susceptibility measurements and electron spin resonance were consistent with the present conclusion.