The relatively strong emission lines belonging to the singly ionized aluminum, titanium and magnesium are discovered on the shortwave spectrogram of planetary nebula IC 2149 obtained with the help of space observatory “Orion-2”. These lines are: 2669 AIII, 3080 Till and 2800 MgVI. At the same time this is the first evidence on the presence of chemical elements of aluminum, titanium and even magnesium (if we do not have in view the early identification of one very faint line, 4571 Mgl, in the spectrum of NGC 7027) in the composition of the planetary nebulae. As a result, the number of chemical elements discovered in planetary nebulae until now reaches up to 19 (from 16).