(Updates with appointment of Pedro Francke)
By Marco Aquino
LIMA, July 30 (Reuters) - Peru's Pedro Castillo appointed moderate economist Pedro Francke as finance minister late on Friday, an olive branch to rattled markets after the newly-elected president earlier named members of his Marxist Free Peru party to several other cabinet positions.
Castillo named Guido Bellido, a hardliner and Marxist from the Andean city of Cuzco who is little known in Lima circles, as prime minister on Thursday, initially dampening investor hopes for a more moderate cabinet. The move hammered bond markets and the sol currency.
But the swearing in later in the day of moderate left-wing economist Francke, a top adviser to Castillo who had helped the recently elected president soften his image, appeared aimed at soothing jittery investors.
Prime Minister Bellido earlier in the evening had expressed on Twitter his "full support" for the more moderate Francke, saying they would "work together for the country."
Francke, a close confidant of Castillo and long a favorite for the finance job, a day earlier had left a ceremony to swear in newly appointed cabinet members just minutes before it started, ratcheting up the drama and leaving investors who favored Francke for the job in the lurch.
Most of the rest of Castillo's cabinet was sworn in on Thursday.
Ivan Merino, a little known mining specialist close to Free Peru, was tapped to oversee the sprawling metals industry in the world's No.2 copper producer. Castillo, a self-described Marxist-Leninist, campaigned on promises to hike taxes on miners to underwrite health and education reforms.
Markets remained on edge throughout the day Friday as investors anxiously awaited Castillo's choice for the key finance minister position.
"Don't worry. Everything's going to be fine," Bellido said in brief comments to reporters early in the day.
Investors were not reassured. Peru's currency, the sol, tumbled to a record low in its largest daily decline in over seven years. The local stock index dropped almost 6% at its session low and posted its lowest close since November.
Castillo, inaugurated on Wednesday, took to Twitter in the early hours of Friday to defend his new government.
"Our cabinet belongs to the people. It answers to the people," Castillo wrote.
"Our commitment is to Peru and to no other interest than to dedicate each and every one of our efforts to build a more just, free and dignified country. We will not disappoint your trust."
Investors are growing wary about Peru's prospects under Castillo, who won last month's election against conservative Keiko Fujimori by a razor-thin margin. After a campaign in which his pledges to distribute wealth more evenly spooked markets but won him votes from Peru's rural poor, he had in recent weeks appeared to take a more moderate tack.
Political wrangling between the radical leftwing arm of his Free Peru party and more centrist allies followed his win.
(Reporting by Marco Aquino, writing by Hugh Bronstein and Dave Sherwood, Editing by Marguerita Choy, Rosalba O'Brien, Gerry Doyle and Raju Gopalakrishnan)