To provide culture condition monitoring devices, culture condition monitoring systems, computer programs and culture condition monitoring methods which can easily monitor a culture status.SOLUTION: The culture condition monitoring device comprises: an image acquisition unit that acquires multiple captured images in which cultured cells are repeatedly imaged with the progress of culture; an identification unit that identifies multiple cell clusters based on each of the acquired captured images; and a display unit that displays culture transition information comprising temporal changes in the particle size distribution of the identified multiple cell clusters.SELECTED DRAWING: Figure 1

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