Polyester combined-filament yarn and woven or knitted fabric comprising it

A combined-filament yarn comprising a multifilament component (A) and a conjugate multifilament component (B) which are combined together, characterized in that

• the multifilament component (A) comprises a plurality of filaments comprising a polyethylene terephthalate resin composition, the polyethylene terephthalate resin composition comprising polyethylene terephthalate polymer, with a metal-containing phosphorus compound (a) represented by the general formula (I):
• wherein R1 and R2 respectively and independently from each the represent a monovalent organic group, M represents an alkali metal atom or alkaline earth metal atom, and m represents an integer of 1 when M is an alkali metal atom and represents a numeric of ½ when M is an alkaline earth metal atom, and an alkaline earth metal compound (b), the metal-containing phosphorus compound (a) and alkaline earth metal compound (b) being mixed, during the production process for the polyethylene terephthalate polymer, into the reaction mixture,
• the conjugate multifilament component (B) comprises a plurality of polyester conjugate filaments having a side-by-side or eccentric core-sheath conjugate fiber structure formed from two mutually different polyester resins, wherein at least one of the two different polyester resins is polytrimethylene terephthalate resin,
• and the mass ratio ((A)/(B)) of the multifilament component (A) with respect to the conjugate multifilament component (B) is in the range of 80:20 to 50:50.