Nov 5 (Reuters) - Foreign investors were net sellers of Japanese shares in the previous week, due to caution about the outcome of the country's general election, while the disappointing outlook from technology blue-chips also weighed on investor sentiment.

Foreigners sold stocks worth a net 91.85 billion yen ($808.25 million) in the week to Oct. 29, after three straight weeks of net buying, data from Japanese exchanges showed.

Investors sold a net $141.5 billion yen in cash equity markets but purchased derivatives of $49.65 billion yen.

Overseas investors also sold a net 1.28 billion yen of Japanese bonds last week, that marked a second straight week of net selling, finance ministry data showed.

Investors turned cautions about the outcome of a highly uncertain contest for the lower house last weekend.

Big technology companies including computer maker Fujitsu and Robot maker Fanuc, cut their earnings outlook citing shortages of chips and other parts last week, that soured sentiment.

However, semiconductor package maker Shinko Electric Industries, electronics parts-maker Maruwa and few other industrial manufacturers, reported upbeat results.

The Nikkei share average added 0.3% last week, although the Topix index fell marginally by 0.05% to decline for a second successive week.

This week, Japanese shares are set for their best week in three weeks, thanks to Prime Minister Fumio Kishida's ruling party's victory in a parliamentary election, that boosted expectations of a stable government and raised hopes of more fiscal stimulus.

Japanese investors sold 647.9 billion yen worth of overseas bonds, and 210.4 billion yen in cross-border equities last week, which marked their first weekly net selling in seven weeks. ($1 = 113.6400 yen)

(Reporting by Gaurav Dogra; Editing by Rashmi Aich)