PROBLEM TO BE SOLVED: To provide a comfortable air mattress.SOLUTION: An air mattress comprises: an air cell part including air cells； and a control unit for controlling inner pressure of the air cells. The control unit performs a first operation when inner pressure of the air cells satisfies a first condition and subsequently satisfies a second condition. The first condition includes: allowing inner pressure to be a second value being lower than a first value from the first value； allowing a difference between the first value and the second value to be equal to or more than a first threshold； and allowing a change rate of inner pressure to a time in a period from the first value to the second value is equal to or more than a second threshold. The second condition includes: allowing inner pressure to be a third value lower than the second value after inner pressure falls from the first value to the second value； and allowing a difference between the second value and the third value to be equal to or more than a third threshold. The control unit changes inner pressure into the second value in the first operation.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】より快適なエアマットレスを提供する。【解決手段】実施形態によれば、エアマットレスは、エアセルを含むエアセル部と、前記エアセルの内圧を制御する制御部と、を含む。前記制御部は、前記エアセルの前記内圧が第１条件を満たした後に第２条件を満たしたときに、第１動作を実施する。前記第１条件は、前記内圧が第１値から前記第１値よりも低い第２値になり、前記第１値と前記第２値との差が第１しきい値以上であり、前記第１値から前記第２値までにおける前記内圧の時間に対する変化率が第２しきい値以上であることを含む。前記第２条件は、前記内圧が前記第１値から前記第２値に低下した後に、前記内圧が前記第２値よりも低い第３値になり、前記第２値と前記第３値との差が第３しきい値以上であることを含む。前記第１動作において、前記制御部は、前記内圧を前記第２値に向けて変化させる。【選択図】図１
