A biodegradable polymer microparticle for a filler comprising a core and a shell, wherein the core contains secondary particles including aggregates of a plurality of primary particles, wherein the shell has a raspberry shaped structure, the biodegradable polymer microparticle characterized in that an average particle diameter (D 50) of the secondary particle ranges from 20 to 200 μm measured by a laser diffraction scattering type particle size analyzer, the biodegradable polymer microparticle contains a first biodegradable polymer microparticle and a second biodegradable polymer microparticle, and the first biodegradable polymer microparticle and the second biodegradable polymer microparticle are polydioxanone, in the case of the first biodegradable polymer microparticle, the content of the biodegradable polymer microparticles in the core is higher than the content of the biodegradable polymer microparticles in the shell, and a difference in concentration between the biodegradable polymer microparticles in the core and the biodegradable polymer microparticles in the shell is 0.01 to 3% by weight, the second biodegradable polymer microparticle has the same concentration in the core and in the shell, the content of the second biodegradable polymer microparticle is 6 to 8% by weight based on the total weight of the first biodegradable polymer microparticle and the second biodegradable polymer microparticle, and an average particle diameter of the primary particle is 3 to 15 μm, an average particle diameter of the secondary particle is 20 to 200 μm, the core is 60 to 95% by volume, and the shell is 5 to 40% by volume with respect to the total volume, said particle diameters being measured by said laser diffraction scattering type particle size analyzer. wherein the shell has a raspberry shaped structure, the biodegradable polymer microparticle characterized in that an average particle diameter (D 50) of the secondary particle ranges from 20 to 200 μm measured by a laser diffraction scattering type particle size analyzer, the biodegradable polymer microparticle contains a first biodegradable polymer microparticle and a second biodegradable polymer microparticle, and the first biodegradable polymer microparticle and the second biodegradable polymer microparticle are polydioxanone, in the case of the first biodegradable polymer microparticle, the content of the biodegradable polymer microparticles in the core is higher than the content of the biodegradable polymer microparticles in the shell, and a difference in concentration between the biodegradable polymer microparticles in the core and the biodegradable polymer microparticles in the shell is 0.01 to 3% by weight, the second biodegradable polymer microparticle has the same concentration in the core and in the shell, the content of the second biodegradable polymer microparticle is 6 to 8% by weight based on the total weight of the first biodegradable polymer microparticle and the second biodegradable polymer microparticle, and an average particle diameter of the primary particle is 3 to 15 μm, an average particle diameter of the secondary particle is 20 to 200 μm, the core is 60 to 95% by volume, and the shell is 5 to 40% by volume with respect to the total volume, said particle diameters being measured by said laser diffraction scattering type particle size analyzer.