The purpose of the present invention is to provide an albumin-sugar chain complex that has bound thereto a sufficient number of sugar chains enabling a sugar-chain clustering effect and that can exist relatively stably in vivo. Provided by the present invention are: an albumin-sugar chain complex characterized by having bound thereto at least five molecules of an asparagine-coupled type sugar chain per one molecule of albumin； a functional molecule carrier that is for selectively delivering a functional molecule to a target tissue in vivo and that includes the albumin-sugar chain complex； and a bio-imaging probe characterized by containing the albumin-sugar chain complex as an active ingredient and characterized as to be used through in vivo administration to an animal.
