The purpose of this paper is to investigate the mechanical properties of a new bulk phosphate glasses (PhGs) belonging to the system Li2O·BaO·Al2O3·La2O3·P2O5, doped with the rare-earth elements. The studied samples of PhGs were prepared by unconventional ‘wet’ method [1]. Supervision of microstructure evolution while synthesis and processing of these materials, as well during their operation, will improve the nano- and micromechanical properties of these vitreous structures. Knowledge of mechanical and microstructural characteristics is essential for detailed understanding of phenomena, which occurs under the PhGs manufacturing and processing, strongly affecting their operating parameters. Particularly, the correlation between structure and mechanical properties is determinative both in the phosphate glasses reliability optimization related to their use in optomechanical devices and in the design of other vitreous materials.   Microstructure and mechanical properties of the PhGs doped with ions of the rare-earth elements (Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb) were analyzed in details. Mechanical parameters were studied by nano- and microidentation dynamic method using the Nanotester PMT3-NI-02 device. Young's modulus (E) and hardness (H) exhibited a random dependence as function of rare-earth ion atomic mass. Instead, it was found the load value influence (Pmax) on H and E: decrease of the peak load applied to the indenter (Pmax = 900, 500, 100, 10 mN) was accompanied by H and E values increase. The most visible impact was noticed in the range between 100 and 10 mN due to scale effect. In the paper [2], it was described that for materials resistance estimation to plastic deformation, besides well-known E and H parameters, are used other characteristics as ‘plasticity index’ and ‘resistance index’. These parameters describe the resistance to deformation and destruction of material under the external concentrated load and are computed as the ratio of material hardness and Young's modulus, respectively, H/E and H3/E2 shown in Figure 1.  As can be seen from Figure 1, both indexes, H/E and H3/E2, decrease with Pmax increase for all studied materials. It denotes that the resistance to indenter penetration into the doped phosphate glasses decreases with the increase of load value.