石川, 亮太郎

林, 明明

橋本, 和幸

毛利, 伊吹

中村, 裕子

石垣, 琢麿

ISHIKAWA, Ryotaro

LIN, Mingming

HASHIMOTO, Kazuyuki

MOHRI, Ibuki

NAKAMURA, Yuuko

ISHIGAKI, Takuma

[SUMMARY] This study developed a smartphone dependency scale（SDS）for use with Japanese university students, and confirmed its validity and reliability. Thus, two investigations were conducted with 325 students to confirm the scale’s psychometric properties, and with 30 students to assess the test?retest reliability. As results, the SDS was constructed as four factor structures（α=.475 to .791）. The reliability of the SDS was also confirmed（test-retest reliability =.746-.843）. The following confirmed the scale’s validity: the total score on the SDS and scores for its subscales were significantly correlated with withdrawal in the context of Internet addiction; one of the subscales of SDS（instability of self-image） was significantly correlated with trait anxiety and poor mental health; and the total score on the SDS and scores for its subscales significantly correlated with spending time on the smartphone. Moreover, SDS scores among female sample were significantly higher than male. The scale’s validity and reliability were thus confirmed.