A production method of liquid medium composition, comprising steps of: passing a first liquid comprising a particular compound of the following (i) through a through-hole having a cross-sectional area of 0.01 mm 2 - 5.00 mm 2 formed in a nozzle part at a flow rate of not less than 1.7 mL/sec, injecting the first liquid into a second liquid comprising a linking substance of the following (ii) at said flow rate to form structures in which the particular compounds are bound via the linking substance and disperse the structures in a mixture of the both liquids mentioned above: (i) a particular compound which is a polymer compound having an anionic functional group, and capable of forming a structure by linking via a divalent metal cation, which structure being capable of suspending a cell or a tissue, wherein said polymer compound is composed of one or two or more kinds from the group consisting of hyaluronic acid, gellan gum, deacylated gellan gum (hereinafter sometimes to be referred to as DAG), rhamsan gum, diutan gum, xanthan gum, carageenan, xanthan gum, hexuronic acid, fucoidan, pectin, pectic acid, pectinic acid, heparan sulfate, heparin, heparitin sulfate, keratosulfate, chondroitin sulfate, dermatan sulfate, rhamnan sulfate and a salt thereof, (ii) a linking substance which is a divalent metal cation, which is one or both of calcium ion and magnesium ion. passing a first liquid comprising a particular compound of the following (i) through a through-hole having a cross-sectional area of 0.01 mm 2 - 5.00 mm 2 formed in a nozzle part at a flow rate of not less than 1.7 mL/sec, injecting the first liquid into a second liquid comprising a linking substance of the following (ii) at said flow rate to form structures in which the particular compounds are bound via the linking substance and disperse the structures in a mixture of the both liquids mentioned above: (i) a particular compound which is a polymer compound having an anionic functional group, and capable of forming a structure by linking via a divalent metal cation, which structure being capable of suspending a cell or a tissue, wherein said polymer compound is composed of one or two or more kinds from the group consisting of hyaluronic acid, gellan gum, deacylated gellan gum (hereinafter sometimes to be referred to as DAG), rhamsan gum, diutan gum, xanthan gum, carageenan, xanthan gum, hexuronic acid, fucoidan, pectin, pectic acid, pectinic acid, heparan sulfate, heparin, heparitin sulfate, keratosulfate, chondroitin sulfate, dermatan sulfate, rhamnan sulfate and a salt thereof, (ii) a linking substance which is a divalent metal cation, which is one or both of calcium ion and magnesium ion. (i) a particular compound which is a polymer compound having an anionic functional group, and capable of forming a structure by linking via a divalent metal cation, which structure being capable of suspending a cell or a tissue, wherein said polymer compound is composed of one or two or more kinds from the group consisting of hyaluronic acid, gellan gum, deacylated gellan gum (hereinafter sometimes to be referred to as DAG), rhamsan gum, diutan gum, xanthan gum, carageenan, xanthan gum, hexuronic acid, fucoidan, pectin, pectic acid, pectinic acid, heparan sulfate, heparin, heparitin sulfate, keratosulfate, chondroitin sulfate, dermatan sulfate, rhamnan sulfate and a salt thereof, (ii) a linking substance which is a divalent metal cation, which is one or both of calcium ion and magnesium ion.