We carried out the PM2.5 components hourly observation using the continuous dichotomous aerosol chemical speciation analyzer (ACSA-14) at Kobe City in Hyogo Prefecture, a coastal area on the Seto Inland Sea. Hourly data of ACSA-14 were analyzed for diurnal variation with the precursor gaseous data and examined for the relationship with wind direction and speed using Conditional Probability Functions. The diurnal variation of the OBC increased in the morning. It is commonly affected by heavy-duty vehicles, and low wind speed conditions cause it to reach high concentrations. The NO3- increased at night in the winter. The diurnal variation of the WSOC was affected by a secondary photochemical generation in the summer and by stabilization of the atmosphere in the winter. The diurnal variations of SO42- and H＋ were affected by exhaust gas from ships on the surrounding sea. Using hourly component data allows for diurnal variation analysis and CPF analysis and makes clear the relationships with meteorological conditions such as a sea and a land breezes.