A polylactic acid resin composition comprising 100 parts by weight of a polylactic
acid, (A) 0 to 10 parts by weight of a phenol antioxidant, and (B) 0.01 to 10 parts
by weight of at least one amide compound selected from the group consisting of
(b-1) an acyclic amide, (b-2) a cyclic amide, (b-3) an acyclic hydrazide, and (b-4)
a cyclic hydrazide or (b-5) a compound represented by formula (P):
##STR1##
wherein Ra and Rb each represent a hydrogen atom, a
hydroxyl group, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having
1 to 8 carbon atoms or an aryl group having 6 to 18 carbon atoms, or they are connected
to each other to form a ring to make a condensed ring having a total carbon-atom
number of 10 to 18; R represents a single bond, an n-valent hydrocarbon group having
2 to 30 carbon atoms, an n-valent heterocyclic group or a group of formula:
##STR2##
