BANGKOK, Nov 8 (Reuters) - Investor confidence in Thailand's stock market has hit a five-month low, weighed down by the Israel-Hamas conflict and capital outflows, a survey by a capital markets group showed on Wednesday.

An October survey by the Federation of Thai Capital Market Organizations (FETCO) showed its overall investor confidence index dropped by 31.5% from the previous survey, slipping into the bearish zone from neutral.

Foreign investors' confidence declined 16.7% from the previous survey, FETCO said in a statement.

Thailand's main stock index has fallen about 15% so far this year, with foreign investors selling about 175 billion baht ($4.93 billion) of Thai shares.

($1 = 35.47 baht) (Reporting by Orathai Sriring and Satawasin Staporncharnchai)