高齡化社會悄然來臨，本研究以中高齡即時通訊軟體使用者為研究對象，探討不同依附風格之中高齡者在使用即時通訊軟體時，對於心理幸福感與孤寂感之增減，並以感知社會支持作為中介變項。研究參與者平均歲數為 63 歲，研究結果顯示，感知社會支持對心理幸福感及孤寂感具有中介效果，且中高齡者使用即時通軟體後，焦慮型和逃避型依附風格較不明顯的使用者、以及安全型依附風格越明顯的使用者，在孤寂感與心理幸福感有顯著改善。

This study examines connections between the elderly’s use of instant messenger, psychological well-being, loneliness and attachment styles. Participants’ average age is 63 years old, ranging from 50 to 83. In this study, the independent variable is the frequency of using instant messenger; the mediator is perceived social support; and the moderator is attachment style. The frequency of using instant messenger was positively related to psychological well-being, and negatively related to loneliness through perceived social support. The findings demonstrate that after using instant messengers, participants feel less lonely, but the effect depends on the attachment styles. Results show that participants who are comfortable with closeness, and less anxious or fearful about their interpersonal relationships have the most significant effect.