NOVELTY - Microorganism carrier manufacture comprises making an aqueous-based binder permeates a microorganism carrier; drying (P2) the aqueous-based binder in a surface part of microorganism carrier to make the carrier (13) set in a semi-drying state; compressing (P3) the semi-dried carrier by integrally compression molding the carrier within a molding die (35) to make a plate-shaped carrier aggregate (14), where fold picking line (14a) is formed in a side of carrier aggregate; and drying (P4) the aqueous-based binder-containing microorganism carrier in compression state.    USE - For manufacturing microorganism carrier for injecting into e.g. purification tank, useful for processing waste water by microorganisms.    ADVANTAGE - The carrier is manufactured easily and stably, and is excellent in sewage-disposal effect. Since the microorganism carrier is in a compression state, packing volume can be made small. Transport and storage can be performed conveniently, without requiring a large place. The warm air used in the second drying process can be recycled, so that the running cost of microorganism carrier manufacturing apparatus is reduced.    DETAILED DESCRIPTION - Microorganism carrier manufacture comprises making an aqueous-based binder permeates a microorganism carrier; drying the aqueous-based binder in a surface part of microorganism carrier to make the carrier set in a semi-drying state; compressing the semi-dried carrier by integrally compression molding the carrier within a molding die to make a plate-shaped carrier aggregate, where fold picking line is formed in a side of carrier aggregate; and drying the aqueous-based binder-containing microorganism carrier in compression state by supplying warm air at a side of carrier aggregate, and performing air-intake from the other side of carrier aggregate, and solidifying. INDEPENDENT CLAIMS are included for:    (1) a molding die; and    (2) a microorganism carrier manufacturing apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows the manufacturing of microorganism carrier.    Carrier (13)    Carrier aggregate (14)    Fold picking line (14a)    Molding die (35)    First drying process (P2)    Compressing process (P3)    Second drying process (P4)