PROBLEM TO BE SOLVED: To solve problems that, there are some irrigation control instruments in which a small amount high frequency irrigation method is performed by employing both various kinds of timers and a soil water sensor, and others in which irrigation is performed on suitable irrigation conditions day and night in the culture of an isolation medium, a container culture medium, a bag medium, and the like however, if control items compose a stage structure in order to apply them to an annual timer, the number of the control items increases very much, and when changing a setup of one of the control items, the selection takes time and modification cannot be easily performed.SOLUTION: The irrigation control instrument according to the present invention includes a switch (1), a display screen (2), and an input button (3). The switch (1) is a type in which control items (8) of an arbitrary irrigation system can be selected from a plurality of irrigation systems (6). The display screen (2) displays a selection item (9) by the switch (1), and the input button (3) is used for operation of a selected item (91) displayed on the display screen (2).
