This paper describes the design of aequorin which is the system for measurement and reduction of the user's stress for a day. This system consists of a wearable device which is composed of a pulse sensor, MCU (Micro Control Unit) board and iPodTouch and also a rocking chair with biofeedback function embedded with LED lights and a display for stress reduction experience. After the user comes back home, the user experiences the stress reduction with the log data measured for the day through the wearable device. The system adopts two approaches for stress reduction; one is an indirect presentation of the stress information as biofeedback in which the system illuminates the LED lights with 1/f noise according to the amount of stress, and the other is a direct presentation of the stress information composed of stress values and their time codes as biofeedback to the display. After introducing the design and implementation of stress reduction, this paper describes about a hearing to validate these approaches, and introduces the limitations of this system.